case study class 10 acids bases and salts

Case Study Questions Class 10 Science Acids, Bases and Salts

Case study questions class 10 science chapter 2 acids, bases and salts.

CBSE Class 10 Case Study Questions Science Acids, Bases and Salts. Important Case Study Questions for Class 10 Board Exam Students. Here we have arranged some Important Case Base Questions for students who are searching for Paragraph Based Questions Acids, Bases and Salts.

CBSE Case Study Questions Class 10 Science Acids, Bases and Salts

Case study : 1.

Based on the above paragraph answer the following questions:

Ans: It is a non- metallic oxide as carbon belongs to non- metals group i.e P – Block elements group 6.

Ans: Mg(OH)2 < Ca(OH)2 < NaOH.

CASE STUDY : 2

Following the above paragraph, answer the following questions;

iv) Does rain water or distilled water will conduct electricity?

Ans: Rain water will conduct electricity as it contains both positive and negative ions of different salts in it.

CASE STUDY : 3

On heating gypsum at 373 K, it loses water molecules and becomes calcium sulphate hemihydrate ( CaSO 4 .½ H 2 O ). This is called Plaster of Paris.Plaster of Paris is a white powder and on mixing with water, it changes to gypsum once again giving a hard solid mass.

i) What is the molecular formula of gypsum?

v) What does this 2 denotes in CaSO4. 2 H2O?

Ans: 2 denotes the two water molecules as water of crystallisation.

CASE STUDY : 4

iv) Where does the sodium hydroxide solution is formed?

artificial fibres

CASE STUDY : 5 (Acids Bases and Salts)

i.e neutral salt is formed.

CASE STUDY : 6

Answer the following on the basis of above paragraph:

iii) What are the important of pH in everyday life?

Case Study Questions Class 10 Science Chapter 2 Acids, Bases, and Salts

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CBSE Board Exam is on the way, so you must practice some good Case Study Questions Class 10 Science to boost your preparation to score 95+% on Boards. In this post, you will get Case Study and Passage Based Questions that will come in CBSE Class 10 Science Board Exams.

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In CBSE Class 10 Science Paper, Students will have to answer some questions based on Assertion and Re a son . There will be a few questions based on case studies and passage-based as well. In that, a paragraph will be given, and then the MCQ questions based on it will be asked.

Acids, Bases, and Salts Case Study Questions With Answers

Here, we have provided case-based/passage-based questions for Class 10 Science Chapter 2 Acids, Bases, and Salts

Case Study/Passage-Based Questions

Case Study 1:

A compound, X of sodium forms a white powder. It is a constituent of baking powder and is used in some antacids. When heated it gives a compound, Y which is anhydrous and absorbs water to become a hydrated salt. When this salt is kept in the open air, it loses water molecules in a process called efflorescence. When dissolved in water it forms a strong base and a weak acid, Z.

(i) What is the compound, X?

Answer: (c) NaOH.

(ii) The compound, Y is

CO .10H O

Answer: (c) Na2CO3.10H2O

(iii) What is the nature of the solution formed by dissolving Y in water?

Answer: (a) Alkaline

(iv) Identify the compound, Z.

Answer: (b) H2CO3

(v) Sodium carbonate is a basic compound because it is a salt of a

Answer: (c) strong acid and weak base

Case Study 2:

pH is quite useful to us in a number of ways in daily life. Some of its applications are:

Control of pH of the soil : Plants need a specific pH range for proper growth. The soil may be acidic, basic, or neutral depending upon the relative concentration of H* and OH-. The pH of any soil can be determined by using pH paper. If the soil is too acidic, it can be corrected by adding lime to it. If the soil is too basic, it can be corrected by adding organic manure which contains acidic materials.

Regaining shine of a tarnished copper vessel by use of acids : A copper vessel gets tarnished due to formation of an oxide layer on its surface. On rubbing lenion on the vessel, the surface is cleaned and the vessel begins to shine again. This is due to the fact that copper oxide is basic in nature, which reacts with the acid (citric acid) present in lemon to form a salt (copper citrate) which is washed away with water. As a result, the layer of copper oxide is removed from the surface of the vessel and the shining surface is exposed.

Self-defence by animals through chemical warfare : Stings of bees and ants contain methanoic acid. When stung, it causes lot of pain and irritation. This can be cured by rubbing the affected area with mild base like baking soda.

(i) When black copper oxide placed in a beaker is treated with dilute HCl, its color changes to ( a) white (b) dark red (c) bluish-green (d) no change.

Answer: (c) bluish green

(ii) P is an aqueous solution of acid and Q is an aqueous solution of base. When these two are diluted separately, then (a) pH of P increases while that of Q decreases till neutralization.

(b) pH of P decreases while that of Q increases till neutralization. (C) pH of both P and Q decrease. (d) pH of both P and Q increase.

Answer: (a) pH of P increases while that of Q decreases till neutralisation.

(iii) Which of the following acids is present in bee sting? (a) Formic acid (b) Acetic acid (c) Citric acid (d) Hydrochloric acid

Answer: (c) Citric acid

(iv) Sting of ant can be cured by rubbing the affected area with soap because (a) it contains oxalic acid which neutralises the effect of formic acid (b) it contains aluminium hydroxide which neutralises the effect of formic acid (c) it contains sodium hydroxide which neutralises the effect of formic acid (d) none of these

Answer: (c) it contains sodium hydroxide which neutralises the effect of formic acid

(v) The pH of soil X is 7.5 while that of soil Y is 4.5. Which of the two soils, should be treated with powdered chalk to adjust its pH? (a) X only (b) Y only (c) Both X and Y (d) none of these

Answer: (b) Y only

Case Study 3: Acids, bases, and salts are essential substances in our daily lives and play crucial roles in various chemical reactions and processes. Acids are sour-tasting substances that can donate hydrogen ions (H+) when dissolved in water. They turn blue litmus paper red and have a pH value less than 7. Bases, on the other hand, are bitter-tasting substances that can accept hydrogen ions or donate hydroxide ions (OH-) when dissolved in water. They turn red litmus paper blue and have a pH value greater than 7. Salts are formed when acids react with bases, resulting in the neutralization process. They are formed by the combination of positive ions (cations) from bases and negative ions (anions) from acids. Understanding the properties and uses of acids, bases, and salts is important in various applications, such as in the preparation of medicines, household cleaning agents, and agricultural practices.

What are acids? a) Substances that can donate hydrogen ions when dissolved in water b) Substances that can accept hydrogen ions when dissolved in water c) Substances that turn blue litmus paper red d) Substances with a pH value less than 7 Answer: a) Substances that can donate hydrogen ions when dissolved in water

How are bases characterized? a) Sour-tasting substances b) Substances that can donate hydrogen ions c) Substances that turn red litmus paper blue d) Substances with a pH value less than 7 Answer: c) Substances that turn red litmus paper blue

What are salts formed from? a) Acids and bases b) Acids and metals c) Bases and metals d) Bases and water Answer: a) Acids and bases

What is the pH value of acids? a) Less than 7 b) Equal to 7 c) Greater than 7 d) Variable Answer: a) Less than 7

In which applications are acids, bases, and salts commonly used? a) Preparation of medicines b) Household cleaning agents c) Agricultural practices d) All of the above Answer: d) All of the above

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Class 10 Science Chapter 2 Case Based Questions - Acids, Bases and Salts

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Case Study - 1

A scale for measuring hydrogen ion concentration in a solution, called pH scale has been developed. The p in pH stands for ‘potenz’ in German, meaning power. On the pH scale we can measure pH generally from 0 (very acidic) to 14 (very alkaline). pH should be thought of simply as a number which indicates the acidic or basic nature of a solution. Higher the hydronium ion concentration, lower is the pH value.

Answer the following on the basis of above paragraph: Q1: What does the scale represent when pH value increases from 7 to 14? Ans: It represents an increase in OH- ions concentration in the solution i.e. the increment in the strength of alkali. Q2: What is the pH value of milk of magnesia? Ans: It is 10. Q3: What are the important of pH in everyday life? Ans: We human beings, plants and animals all are sensitive to pH i.e. their body work on normal pH such as plants grow between the pH range of 6 to 8. Our human body work within the pH range of 7 to 7.8. Q4: What happens when the pH of mouth is lower than 5.5? Ans: Tooth decay starts in which the enamel gets corroded due to the much production of acids in mouth by bacteria. Q5: Two solutions X&Y. The pH of X is 4 and the pH of Y is 7. What is the nature of two solution? Ans: Solution X is acidic in nature and the solution Y is neutral in nature.

Case Study - 2

Salts of a strong acid and a strong base are neutral with pH value of 7. On the other hand, salts of a strong acid and weak base are acidic with pH value less than 7 and those of a strong base and weak acid are basic in nature, with pH value more than 7.

Answer the following in reference to the above paragraph: Q1: Classify the following as strong bases and weak bases: KOH, NaOH, CsOH, NH4OH Ans: Strong bases: KOH, NaOH, CsOH Weak base: NH 4 OH Q2: Write a reaction of a strong acid and a weak base? Ans: HCl(aq) + NH 4 OH(aq) → NH 4 Cl(aq) + H 2 O(aq) Q3: What happens when strong acids and bases react to each other? Explain by giving example. Ans: HCl + NaOH → NaCl + H 2 O i.e. neutral salt is formed. Q4: Identify the following as strong acid: CH 3 COOH, H 2 SO 4 , HNO 3 , H 3 PO 4 , H 2 CO 3 , HCl. Ans: Strong acid: HCl, HNO 3 , H 2 SO 4 . Q5: Classify the following acis as strong or weak acid: acetic acid, citric acid, tartaric acid, oxalic acid. Ans: All are weak acid present in fruits and vegetables.

Case Study - 3

Sodium hydroxide When electricity is passed through an aqueous solution of sodium chloride (called brine), it decomposes to form sodium hydroxide. The process is called the chlor-alkali process because of the products formed– chlor for chlorine and alkali for sodium hydroxide.

Based on the above given information, answer the following questions: Q1: Write the chemical equation involved in this process? Ans: 2NaCl (aq)+ 2H 2 O(l) → 2 NaOH(aq) + Cl 2 (g) + H 2 (g) Q2: What are the substance that are formed at anode and cathode on chlor- alkali process? Ans: At anode Chlorine gas & at cathode hydrogen gas are formed. Q3: What are the uses of chlorine? Ans:

Used for water treatment
Disinfectants
pesticides.

Q4: Where does the sodium hydroxide solution is formed? Ans: It is formed near the cathode. Q5: What are the uses of Sodium hydroxide? Ans:

uses in making soaps and detergents
artificial fibres
paper making

Case Study - 4

Plaster of Paris On heating gypsum at 373 K, it loses water molecules and becomes calcium sulphate hemihydrate ( CaSO 4 .½ H 2 O ). This is called Plaster of Paris. Plaster of Paris is a white powder and on mixing with water, it changes to gypsum once again giving a hard solid mass. Water of crystallisation is the fixed number of water molecules present in one formula unit of a salt. Five water molecules are present in one formula unit of copper sulphate. Chemical formula for hydrated copper sulphate is Cu SO 4 . 5H 2 O. Now you would be able to answer the question whether the molecule of Na2CO3 .10H2O is wet.

Answer the following questions on the basis of the above paragraph: Q1: What is the molecular formula of gypsum? Ans: CaSO 4 . 2H 2 O Q2: Write the equation of formation of plaster of paris by heating gypsum? Ans: CaSO 4 . 2H 2 O + heat ⇒ CaSO 4 . 1/2 H 2 O + 1^1/2 H 2 O Q3: What are the uses of Plaster of Paris? Ans: It is used by doctor for supporting of fractured bones, to make toys etc. Q4: Give the equation when POP is mixed with water? Ans: CaSO4. 1/2H2O + 1^1/2 H2O ⇒ CaSO4. 2H2O Q5: What does this 2 denotes in CaSO 4 . 2 H 2 O? Ans: 2 denotes the two water molecules as water of crystallisation.

Case Study - 5

Take solutions of glucose, alcohol, hydrochloric acid, sulphuric acid, etc. n Fix two nails on a cork, and place the cork in a 100 mL beaker. Connect the nails to the two terminals of a 6 volt battery through a bulb and a switch, as shown in. Now pour some dilute HCl in the beaker and switch on the current. Repeat with dilute sulphuric acid. What do you observe? Repeat the experiment separately with glucose and alcohol solutions. What do you observe now? Does the bulb glow in all cases?

Following the above paragraph, answer the following questions; Q1: What was the changes occur in case of acids i.e HCl, H2SO4? Ans: The bulbs will start glowing as it contains hydrogen ions H+ ions (aq) as cation and Cl- or SO4^2- as anion. Q2: Why do glucose and alcohol do not conduct electricity? Ans: They do not contains free ions neither cation nor anion. To conduct electricity, free ions are required. Q3: Why do acids do not show acidic behaviour in absence of water? Ans: Acidic behaviour are shown by releasing of H+ ions from acids. To dissociate into H+ ions, the acids need medium i.e water. Q4: Does rain water or distilled water will conduct electricity? Ans: Rain water will conduct electricity as it contains both positive and negative ions of different salts in it. Q5: Why do aqueous solution of acids conduct electricity? Ans: The acid contains Hydrogen ions in solutions as well as anions. Due to the presence of free ions they conduct electricity.

Case Study - 6

The reaction between carbon dioxide and calcium hydroxide (lime water), Calcium hydroxide, which is a base, reacts with carbon dioxide to produce a salt and water. Since this is similar to the reaction between a base and an acid, we can conclude that nonmetallic oxides are acidic in nature.

Based on the above paragraph answer the following questions: Q1: What is the nature of Carbon dioxide? Ans: It is a non- metallic oxide as carbon belongs to non- metals group i.e P – Block elements group 6. Q2: Give another reaction of non- metallic oxide and a base? Ans: CO 2 (g) + 2NaOH(aq)→ Na 2 CO 3 (aq) + H 2 O(aq) Q3: Arrange the following bases in increasing order: NaOH, Ca(OH) 2 & Mg(OH) 2 . Ans: Mg(OH) 2 < Ca(OH) 2 < NaOH. Q4: Write the complete reaction between calcium hydroxide and carbon dioxide with physical states? Ans: Ca(OH) 2 (aq) + CO 2 (g) → CaCO 3 (s) + H 2 O(l) Q5: What is the nature of non- metallic oxide? Ans: The non- metallic oxide are acidic in nature because when they dissolved in water, they form acidic substance turning blue litmus into red.

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Class 10 Science: Case Study Chapter 2 Acids, Bases, and Salts PDF Download

In CBSE Class 10 Science Paper, Students will have to answer some questions based on Assertion and Reason . There will be a few questions based on case studies and passage-based as well. In that, a paragraph will be given.

Here we are providing you with Class 10 Science Chapter 2 Acids, Bases, and Salts Case Study Questions, by practicing this Case Study and Passage Based Questions will help you in your Class 10th Board Exam.

Case Study Chapter 2 Acids, Bases, and Salts

Here, we have provided case-based/passage-based questions for Class 10 Science Chapter 2 Acids, Bases, and Salts

Case Study/Passage-Based Questions

Question 1:

(i) What is the compound, X?

Answer: (c) NaOH.

(ii) The compound, Y is

CO .10H O

Answer: (c) Na2CO3.10H2O

(iii) What is the nature of the solution formed by dissolving Y in water?

Answer: (a) Alkaline

(iv) Identify the compound, Z.

Answer: (b) H2CO3

(v) Sodium carbonate is a basic compound because it is a salt of a

Answer: (c) strong acid and weak base

Question 2:

pH is quite useful to us in a number of ways in daily life. Some of its applications are:

(i) When black copper oxide placed in a beaker is treated with dilute HCl, its color changes to ( a) white (b) dark red (c) bluish-green (d) no change.

Answer: (c) bluish green

(ii) P is an aqueous solution of acid and Q is an aqueous solution of base. When these two are diluted separately, then (a) pH of P increases while that of Q decreases till neutralization.

(b) pH of P decreases while that of Q increases till neutralization. (C) pH of both P and Q decrease. (d) pH of both P and Q increase.

Answer: (a) pH of P increases while that of Q decreases till neutralisation.

(iii) Which of the following acids is present in bee sting? (a) Formic acid (b) Acetic acid (c) Citric acid (d) Hydrochloric acid

Answer: (c) Citric acid

Answer: (c) it contains sodium hydroxide which neutralises the effect of formic acid

(v) The pH of soil X is 7.5 while that of soil Y is 4.5. Which of the two soils, should be treated with powdered chalk to adjust its pH? (a) X only (b) Y only (c) Both X and Y (d) none of these

Answer: (b) Y only

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Case Study Chapter 2 Acids Bases Salts

Please refer to Chapter 2 Acids Bases Salts Case Study Questions with answers provided below. We have provided Case Study Questions for Class 10 Science for all chapters as per CBSE, NCERT and KVS examination guidelines. These case based questions are expected to come in your exams this year. Please practise these case study based Class 10 Science Questions and answers to get more marks in examinations.

Case Study Questions Chapter 2 Acids Bases Salts

Case/Passage – 1 Marble’s popularity began in ancient Rome and Greece, where white and off-white marble were used to construct a variety of structures, from hand-held sculptures to massive pillars and buildings.

Question: A student added 10g of calcium carbonate in a rigid container, secured it tightly and started to heat it. After some time, an increase in pressure was observed, the pressure reading was then noted at intervals of 5 mins and plotted against time, in a graph as shown below. During which time interval did maximum decomposition took place?

(a) 15-20 min (b) 10-15 min (c) 5-10 min (d) 0-5 min

Question: Marble statues are corroded or stained when they repeatedly come into contact with polluted rain water.Identify the main reason.

(a) decomposition of calcium carbonate to calcium oxide (b) polluted water is basic in nature hence it reacts with calcium carbonate (c) polluted water is acidic in nature hence it reacts with calciumcarbonate (d) calcium carbonate dissolves in water to give calcium hydroxide.

Question: Gas A, obtained above is a reactant for a very important biochemical process which occurs in the presence of sunlight. Identify the name of the process – (a) Respiration (b) Photosynthesis (c) Transpiration (d) Photolysis and buildings.

Question: The substance not likely to contain CaCO 3 is (a) Dolomite (b) A marble statue (c) Calcined gypsum (d) Sea shells.

Question: Calcium oxide can be reduced to calcium, by heating with sodium metal. Which compound would act as an oxidizing agent in the above process? (a) sodium (b) sodium oxide (c) calcium (d) calcium oxide Frothing in Yamuna:

Case/Passage – 2 The primary reason behind the formation of the toxic foam is high phosphate content in the wastewater because of detergents used in dyeing industries, dhobi ghats and households.Yamuna’s pollution level is so bad that parts of it have been labelled ‘dead’ as there is no oxygen in it for aquatic life to survive.

Question: High content of phosphate ion in river Yamuna may lead to: (a) decreased level of dissolved oxygen and increased growth of algae (b) decreased level of dissolved oxygen and no effect of growth of algae (c) increased level of dissolved oxygen and increased growth of algae (d) decreased level of dissolved oxygen and decreased growth of algae

Question: Which of the following correctly represents the solutions in increasing order of their hydronium ion concentration? (a) P > Q > R > S (b) P > S > Q > R (c) S < Q < R < P (d) S < P < Q < R

Question: Which of the following statements is correct for the water with detergents dissolved in it? (a) low concentration of hydroxide ion (OH– )and high concentration of hydronium ion (H3 O +) (b) high concentration of hydroxide ion (OH–)and low concentration of hydronium ion (H 3 O+) (c) high concentration of hydroxide ion (OH–) as well as hydronium ion (H 3 O+) (d) equal concentration of both hydroxide ion (OH–) and hydronium ion (H 3 O+). The table provides the pH value of four solutions P, Q, R and S

Question: Predict the pH value of the water of river Yamuna if the reason for froth is high content of detergents dissolved in it. (a) 10-11 (b) 5-7 (c) 2-5 (d) 7

Question: If a sample of water containing detergents is provided to you, which of the following methods will you adopt to neutralize it? (a) Treating the water with baking soda (b) Treating the water with vinegar (c) Treating the water with caustic soda (d) Treating the water with washing soda

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Acids Bases and Salts Class 10 Case Study Questions Science Chapter 2

Last Updated on May 15, 2024 by XAM CONTENT

Hello students, we are providing case study questions for class 10 science. Case study questions are the new question format that is introduced in CBSE board. The resources for case study questions are very less. So, to help students we have created chapterwise case study questions for class 10 science. In this article, you will find case study questions for cbse class 10 science chapter 2 Acids Bases and Salts.

	Acids Bases and Salts
	Case Study Questions
	Competency Based Questions
	CBSE
	10
	Science
	Class 10 Studying Students
	Yes
	Mentioned

Table of Contents

Case Study Questions on Acids Bases and Salts

Question 1:

pH is quite useful to us in a number of ways in daily life. Some of its applications are:

Control of pH of the soil: Plants need a specific pH range for proper growth. The soil may be acidic, basic or neutral depending upon the relative concentration of H+ and OH-. The pH of any soil can be determined by using pH paper. If the soil is too acidic, it can be corrected by adding lime to it. If the soil is too basic, it can be corrected by adding organic manure which contains acidic materials.

Regaining shine of a tarnished copper vessel by use of acids: A copper vessel gets tarnished due to formation of an oxide layer on its surface. On rubbing lemon on the vessel, the surface is cleaned and the vessel begins to shine again. This is due to the fact that copper oxide is basic in nature, which reacts with the acid (citric acid) present in lemon to form a salt (copper citrate) which is washed away with water. As a result, the layer of copper oxide is removed from the surface of the vessel and the shining surface is exposed.

Self-defence by animals through chemical warfare: Stings of bees and ants contain methanoic acid. When stung, it causes lot of pain and irritation. This can be cured by rubbing the affected area with mild base like baking soda.

Read the above passage carefully and give the answer to the following questions:

(i) When black copper oxide placed in a beaker is treated with dilute HCl, its colour changes to (a) white (b) dark red (c) bluish green (d) no change.

Difficulty Level: Medium

Ans. Option (c) is correct. Explanation: CuO + 2HCl → CuCl 2 + 2H 2 O, CuCl 2 is bluish green in colour.

(ii) P is an aqueous solution of acid and Q is an aqueous solution of base. When these two are diluted separately, then (a) pH of P increases while that of Q decreases till neutralisation. (b) pH of P decreases while that of Q increases till neutralisation. (c) pH of both P and Q decrease. (d) pH of both P and Q increase.

Ans. Option (a) is correct. Explanation: On diluting, H+ ion concentration reduces per unit volume thus, pH increases. On the other hand, on diluting, OH– concentration also reduces, pOH increases and pH decreases. As, pOH + pH = 14. Thus, pH of Q (basic solution) decreases while that of P (acidic solution) increases on dilution.

(iii) Which of the following acids is present in bee sting? (a) Formic acid (b) Acetic acid (c) Citric acid (d) Hydrochloric acid

Ans. Option (c) is correct. Explanation: Formic acid is the common name of methanoic acid, and it is present in bee sting

Difficulty Level: Easy

Ans. Option (c) is correct

(v) The pH of soil X is 7.5 while that of soil Y is 4.5. Which of the two soils, should be treated with powdered chalk to adjust its pH? (a) X only (b) Y only (c) Both X and Y (d) None of these

Ans. Option (b) is correct. Explanation: Soil Y is acidic. Hence, it should be treated with powdered chalk to reduce its acidity

Chemical Reactions and Equations Class 10 Case Study Questions Science Chapter 1

Topics from which case study questions may be asked.

Introduction to Acids, Bases, and Salts
Definitions of Acids and Bases
Properties of Acids and Bases
Salts and their Types
Importance and Uses of Acids, Bases, and Salts
Preparation and Properties of Some Important Compounds
Chemical Reactions of Acids and Bases

This chapter deals with the basic understanding of acids, bases, and salts, including their properties, reactions, pH scale, indicators, and practical applications.

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Frequently Asked Questions (FAQs) on Heat Case Study Questions

Q1: what are case study questions for cbse examinations.

A1: Case study questions in CBSE examinations typically involve scenarios or real-life examples, requiring students to apply their understanding of concepts to solve problems or analyze situations.

Q2: Why are case study questions important for understanding class 10 science chapters?

A2: Case study questions provide a practical context for students to apply theoretical knowledge to real-world situations, fostering deeper understanding and critical thinking skills.

Q3: How should students approach answering case study questions for CBSE?

A3: Students should carefully read the case study, identify the key issues or problems presented, analyze the information provided, apply relevant concepts and principles of chemical reactions and equations, and formulate well-supported solutions or responses.

Q4: Are there any resources available online for students to practice case study questions on class 10 science chapters for CBSE exams?

A4: Yes, several educational websites offer case study questions for CBSE students preparing for science examinations. We also offer a collection of case study questions for all classes and subject on our website. Visit our website to access these questions and enhance your learning experience. If you need more case study questions for your preparation, then you visit Physics Gurukul website.

Q5: How can students effectively prepare for case study questions on chemical reactions and equations for CBSE exams?

A5: Effective preparation strategies include regular revision of concepts, solving practice questions, analyzing case studies from previous exams, seeking clarification on doubts, and consulting with teachers or peers for guidance and support.

Q6: How can teachers incorporate case study questions on acids, bases and salts class 10 science into classroom teaching?

A6: Teachers can integrate case studies into lesson plans, group discussions, or interactive activities to engage students in active learning, promote problem-solving skills, and facilitate a deeper understanding of acids, bases and salts.

Q7: What is an acid?

A7: An acid is a substance that ionizes in water to produce hydrogen ions (H⁺) as the only positive ions. Examples include hydrochloric acid (HCl) found in gastric juices, citric acid in citrus fruits, acetic acid in vinegar, and sulfuric acid (H₂SO₄) in car batteries.

Q8: What are the properties of acids?

A8: Acids taste sour, turn blue litmus paper red, react with metals to produce hydrogen gas, and react with bases to form salts and water.

Q9: How do acids react with metals? Give examples.

A9: Acids react with metals to produce a salt and hydrogen gas. For example: 2HCl + Mg → MgCl₂ + H₂.

Q10: What is a base?

A10: A base is a substance that ionizes in water to produce hydroxide ions (OH⁻) as the only negative ions. Examples include sodium hydroxide (NaOH), potassium hydroxide (KOH), and calcium hydroxide [Ca(OH)₂].

Q11: What are the properties of bases?

A11: Bases taste bitter, feel slippery, turn red litmus paper blue, and react with acids to form salts and water.

Q12: Differentiate between acids and bases based on their taste, effect on litmus paper, and chemical behavior.

A12: Acids taste sour, turn blue litmus paper red, and react with metals to produce hydrogen gas. Bases taste bitter, turn red litmus paper blue, and react with acids to form salts and water.

Acids Bases and Salts Class 10 Case Study Questions Science Chapter 2

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CBSE 10th Standard Science Subject Acids, Bases and Salts Chapter Case Study Questions 2021

By QB365 on 21 May, 2021

QB365 Provides the updated CASE Study Questions for Class 10 , and also provide the detail solution for each and every case study questions . Case study questions are latest updated question pattern from NCERT, QB365 will helps to get more marks in Exams

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Cbse 10th standard science subject acids, bases and salts case study questions 2021.

10th Standard CBSE

Final Semester - June 2015

Baking powder produces carbon dioxide on heating, so it is used in cooking to make the batter spongy. Although, baking soda also produces CO 2 on heating, but it is not used in cooking because on heating, baking soda produces sodium carbonate along with carbon dioxide. Sodium carbonate, thus, produced, makes the taste bitter. Baking powder is the mixture of baking soda and a mild edible acid. Generally, tartaric acid is mixed with baking soda to make baking powder. When baking powder is heated, NaHCO 3 decomposes to give CO 2 which makes bread and cake fluffy. Tartaric acid helps to remove bitter taste due to formation of sodium tartrate. \(2 \mathrm{NaHCO}_{3}+ \ \ \mathrm{C}_{4} \mathrm{H}_{6} \mathrm{O}_{6} \quad \longrightarrow \quad 2 \mathrm{CO}_{2}+2 \mathrm{H}_{2} \mathrm{O}+\mathrm{Na}_{2} \mathrm{C}_{4} \mathrm{H}_{4} \mathrm{O}_{6}\) Baking soda Tartaric acid Carbon dioxide Sodium tartrate (i) On passing excess CO 2 gas in aqueous solution of sodium carbonate, the substance obtained is


CO ·10H O	·H O

(ii) When sodium hydrogen carbonate is added to acetic acid, it evolves a gas. Which of the following statements are true about the gas evolved? (I) It turns lime water milky (II) It extinguishes a burning splinter (III) It dissolves in a solution of sodium hydroxide (IV) It has a pungent odour

(iii) Select the correct statement regarding sodium hydrogen carbonate.

are produced during the heating ofNaHCO

(iv) Acetic acid was added to a solid X kept in a test tube. A colourless and odourless gas was evolved. The gas was passed through lime water which turned milky. It was concluded that

(v) Which of the following statements are correct regarding baking soda? (I) Baking soda is sodium hydrogen carbonate (II) On heating, baking soda gives sodium carbonate (III) It is used for manufacture of soap (IV) It is an ingredient of baking powder

Bleaching powder is also known as chloride of lime. It is a solid and yellowish white in colour. Bleaching powder can be easily identified by the strong smell of chlorine. When calcium hydroxide (slaked lime) reacts with chlorine, it gives calcium oxychloride (bleaching powder) and water is formed. Aqueous solution of bleaching powder is basic in nature. The material to be bleached is first passed through solution of NaOH to remove greasy matter. Then it is passed through aqueous solution of bleaching powder and very dil. HCI solution. HCI reacts with bleaching powder to liberate nascent oxygen which bleaches material. (i) Bleaching powder is used as

(ii) Bleaching powder is also known as

(iii) Bleaching powder gives smell of chlorine because it

(iv) Select the correct statement(s) regarding bleaching powder.

(v) Identify the product 'X' in the given reaction \(\mathrm{Ca}(\mathrm{OH})_{2}+\mathrm{Cl}_{2} \longrightarrow X+\mathrm{H}_{2} \mathrm{O}\)

)

The preparation of washing soda is carried out through following steps: Step-I: Manufacture of sodium hydrogen carbonate: \(\mathrm{NaCl}+\mathrm{H}_{2} \mathrm{O}+\mathrm{NH}_{3}+\mathrm{CO}_{2} \longrightarrow \ \mathrm{NaHCO}_{3}+ \ \mathrm{NH}_{4} \mathrm{Cl}\) Sodium hydrogen carbonate Step-II : Thermal decomposition of sodium hydrogen carbonate: When dry crystals of sodium hydrogen carbonate are heated strongly, they decompose to form anhydrous sodium carbonate (soda ash). \(2 \mathrm{NaHCO}_{3(s)} \longrightarrow \mathrm{Na}_{2} \mathrm{CO}_{3(s)}+\mathrm{CO}_{2(g)}+\mathrm{H}_{2} \mathrm{O}_{(g)}\) Step-III : Recrystallisation of sodium carbonate: Sodium carbonate thus obtained is recrystallised to form crystals of washing soda. \(\mathrm{Na}_{2} \mathrm{CO}_{3(s)}+ 10 \mathrm{H}_{2} \mathrm{O}_{(l)} \longrightarrow \mathrm{Na}_{2} \mathrm{CO}_{3} \cdot 10 \mathrm{H}_{2} \mathrm{O}_{(s)}\) Anhydrous Washing soda sodium carbonate (i) Some of the uses of washing soda are given below: (I) It is used for removing permanent hardness of water (II) It is used in glass industry (III) It is used in paper industry (IV) It is used in the manufacture of sodium compounds such as borax Select the correct option regarding uses of washing soda

(ii) What products will be formed along with water when sodium carbonate reacts with dilute hydrochloric acid?

(iii) Chief raw materials for the manufacture of washing soda are

(iv) What is the action of sodium carbonate on litmus paper?

(v) What products will be obtained when solution of sodium carbonate and slaked lime is heated?

	and NaOH
and NaOH

"Indicator is a chemical compound which is added to the solution in very small amount to detect its acidic or basic nature:" As they show colour change in acidic and basic medium, they are also called acid-base indicators. In other words, "an acid-base indicator is that substance which possesses one colour in acidic medium and a different colour in alkaline medium:'' Indicators, basically, are coloured organic substances either extracted from plants (natural indicators) or synthesised in the laboratory (synthetic indicators). A few common acid base indicators are: Litmus, phenolphthalein, methyl orange etc. In addition to these there are some naturally occurring substances which have different smell in acidic and basic medium. These substances are called olfactory indicators. (i) Which one of the following will turn red litmus blue?

(ii) A solution turns blue litmus red. The pH of the solution is probably

(iii) A solution in test tube 'A' turns red litmus blue, evolves hydrogen gas on reaction with zinc and does not react with sodium carbonate. Whereas, solution in test tube 'B' turns blue litmus red, liberates hydrogen gas on reaction with zinc and evolves carbon dioxide gas with sodium carbonate. Identify 'A' and 'B'

(iv) Select the incorrect option

(v) Which one of the following can be used as an acid-base indicator by visually impaired student?

Acids turn blue litmus red but have no effect on red litmus. Bases turn red litmus blue but have no effect on blue litmus. The sample in which phenolphthalein remains colourless while methyl orange changes to pink/ red are acids while the samples in which phenolphthalein colour changes to pink and methyl orange changes to yellow are bases. Some observations of different sample solutions in litmus, phenolphthalein and methyl orange indicator are given in the table.


HCI	No colour change	Red	Colourless	Red/ Pink
H2 SO	No colour change	Red	Colourless	Red/ Pink
HNO	No colour change	Red	Colourless	Red/ Pink
CH COOH	No colour change	Red	Colourless	Red/ Pink
NaOH	Blue	No colour change	Pink	Yellow
Ca(OH)	Blue	No colour change	Pink	Yellow
KOH	Blue	No colour change	Pink	Yellow
Mg(OH)	Blue	No colour change	Pink	Yellow
NH OH	Blue	No colour change	Pink (Becomes colourless after sometime)	Yellow (Becomes colourless after sometime)

(i) Which of the following substances does not turn red litmus solution to blue?

(ii) Phenolphthalein's colour in basic medium is ___________but in acid it is ___________ .

(iii) Which of the following acids are edible? (I) Citric acid (II) Tartaric acid (III) Hydrochloric acid (IV) Carbonic acid.

(iv) The colour of methyl orange in neutral solution is

(v) Which of the following cannot act as an indicator?

*****************************************

Cbse 10th standard science subject acids, bases and salts case study questions 2021 answer keys.

\({ (i) }(\mathrm{b}): \mathrm{Na}_{2} \mathrm{CO}_{3}+\mathrm{H}_{2} \mathrm{O}+\mathrm{CO}_{2} \longrightarrow 2 \mathrm{NaHCO}_{3}\) (ii) (b) : \(\mathrm{NaHCO}_{3}+\mathrm{CH}_{3} \mathrm{COOH} \longrightarrow \mathrm{CH}_{3} \mathrm{COONa}\) \(+\mathrm{CO}_{2} \uparrow+\mathrm{H}_{2} \mathrm{O}\) Carbon dioxide gas is evolved which turns limewater milky. It extinguishes a burning splinter since it is not a supporter of combustion. It dissolves in sodium hydroxide solution and it is an odourless gas. \({ (iii) }(\mathrm{c}): 2 \mathrm{NaHCO}_{3} \stackrel{\text { Heat }}{\longrightarrow} \mathrm{Na}_{2} \mathrm{CO}_{3}+\mathrm{H}_{2} \mathrm{O}+\mathrm{CO}_{2}\) NaHCO 3 is soluble in water. \({ (iv) }(\mathbf{b}): \mathrm{NaHCO}_{3}+\mathrm{CH}_{3} \mathrm{COOH} \longrightarrow\) \(\mathrm{CH}_{3} \mathrm{COONa}+\mathrm{CO}_{2}+\mathrm{H}_{2} \mathrm{O}\) (v) (c): It is not used in manufacture of soap .

(i) (d) (ii) (d) (iii) (b): Bleaching powder gives chlorine on exposure to air by reacting with CO 2 . \(\mathrm{CaOCl}_{2}+\mathrm{CO}_{2} \longrightarrow \mathrm{CaCO}_{3}+\mathrm{Cl}_{2}\) (iv) (d) \({ (v) }(\mathrm{a}): \mathrm{Ca}(\mathrm{OH})_{2}+\mathrm{Cl}_{2} \longrightarrow \mathrm{CaOCl}_{2}+\mathrm{H}_{2} \mathrm{O}\)

(i) (d) (ii) (c): Na2CO 3 reacts with dilute acids to give COgas with brisk effervescence. \(\mathrm{Na}_{2} \mathrm{CO}_{3(s)}+2 \mathrm{HCl}_{(a q)} \longrightarrow 2 \mathrm{NaCl}_{(a q)}+\mathrm{H}_{2} \mathrm{O}_{(l)}\) \(+\mathrm{CO}_{2(g)} \uparrow\) Sodium Dil. Hydrochloric Sodium Water Carbon dioxide carbonate acid chloride (iii) (a): Chief raw materials for the manufacture of washing soda are sodium chloride (NaCl), ammonia (NH 3 ) and limestone (CaCO 3 ) (iv) (a): Sodium carbonate turns red litmus blue (v) (b): Sodium hydroxide and calcium carbonate are formed when the solution of sodium carbonate and slaked lime, Ca(OH) 2 is heated \(\mathrm{Na}_{2} \mathrm{CO}_{3}+\mathrm{Ca}(\mathrm{OH})_{2} \longrightarrow 2 \mathrm{NaOH}+\mathrm{CaCO}_{3}\)

(i) (b) : Baking soda (NaHCO 3 ) is basic in nature. (ii) (d) : The solution turns blue litmus red, hence it is acidic. (iii) (b): Acids turn blue litmus red, liberate hydrogen gas with zinc and evolve carbon dioxide gas with metal carbonates. Bases turn red litmus blue, evolve hydrogen gas with zinc and do not react with metal carbonates (iv) (b):


Flowers of hydrangea plant (blue)	Blue	Blue

(v) (c): Vanilla essence is an olfactory indicator. So, its smell is different in acidic and basic medium which can be detected easily by a visually impaired student.

(i) (c) (ii) (a) (iii) (b): Citric and tartaric acid are from organic substances such as lemon and tamarind respectively and they are edible. Hydrochloric acid though formed inside stomach is not edible. Carbonic acid is a mild acid and is edible in the form of soda water. (iv) (b) (v) (b)

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Case Study Questions Class 10 Science

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Download Case study questions for CBSE class 10 Science in PDF format from the myCBSEguide App . We have the new pattern case study-based questions for free download. Class 10 Science case study questions

This article will guide you through:

What are case study questions?

Sample Papers with Case Study questions
Class 10 Science Case Study question examples
How to get case-based questions for free?
How to attempt the case-based questions in Science?

Questions based on case studies are some real-life examples. The questions are asked based on a given paragraph i.e. Case Study. Usually, 4-5 questions are asked on the basis of the given passage. In most cases, these are either MCQs or assertion & reason type questions. Let’s take an example to understand. There is one paragraph on how nitrogen is generated in the atmosphere. On the basis of this paragraph, the board asks a few objective-type questions. In other words, it is very similar to the unseen passages given in language papers. But the real cases may be different. So, read this article till the end to understand it thoroughly.

What is CBE?

CBSE stands for competency-based education. The case study questions are part of this CBE. The purpose of CBE is to demonstrate the learning outcomes and attain proficiency in particular competencies.

Questions on Real-life Situations

As discussed the case study questions are based on real-life situations. Especially for grade 10 science, it is very essential to have the practical knowledge to solve such questions. Here on the myCBSEguide app, we have given many such case study paragraphs that are directly related to real-life implications of the knowledge.

Sample Papers with Case Study Questions

Class 10 Science Sample Papers with case study questions are available in the myCBSEguide App . There are 4 such questions (Q.No.17 to 20) in the CBSE model question paper. If you analyze the format, you will find that the MCQs are very easy to answer. So, we suggest you, read the given paragraph carefully and then start answering the questions. In some cases, you will find that the question is not asked directly from the passage but is based on the concept that is discussed there. That’s why it is very much important to understand the background of the case study paragraph.

CBSE Case Study Sample Papers

You can download CBSE case study sample papers from the myCBSEguide App or Student Dashboard. Here is the direct link to access it.

Case Study Question Bank

As we mentioned that case study questions are coming in your exams for the last few years. You can get them in all previous year question papers issued by CBSE for class 1o Science. Here is the direct link to get them too.

Class 10 Science Case Study Question Examples

As you have already gone through the four questions provided in the CBSE model question paper , we are proving you with other examples of the case-based questions in the CBSE class 10 Science. If you wish to get similar questions, you can download the myCBSEguide App and access the Sample question papers with case study-type questions.

Case-based Question -1

Read the following and answer any four questions: Salt of a strong acid and strong base is neutral with a pH value of 7. NaCl common salt is formed by a combination of hydrochloride and sodium hydroxide solution. This is the salt that is used in food. Some salt is called rock salt bed of rack salt was formed when seas of bygone ages dried up. The common salt thus obtained is an important raw material for various materials of daily use, such as sodium hydroxide, baking soda, washing soda, and bleaching powder.

Phosphoric acid
Carbonic acid
Hydrochloric acid
Sulphuric acid
Blue vitriol
Washing soda
Baking soda
Bleaching powder

Case-based Question -2

V 1 + V 2 + V 3
V 1 – V 2 +V 2
None of these
same at every point of the circuit
different at every point of the circuit
can not be determined
20 3 Ω 203Ω
15 2 Ω 152Ω

Case-based Question -3

pure strips
impure copper
refined copper
none of these
insoluble impurities
soluble impurities
impure metal
bottom of cathode
bottom of anode

How to Attempt the Case-Based Questions in Science?

Before answering this question, let’s read the text given in question number 17 of the CBSE Model Question Paper.

All living cells require energy for various activities. This energy is available by the breakdown of simple carbohydrates either using oxygen or without using oxygen.

See, there are only two sentences and CBSE is asking you 5 questions based on these two sentences. Now let’s check the first questions given there.

Energy in the case of higher plants and animals is obtained by a) Breathing b) Tissue respiration c) Organ respiration d) Digestion of food

Now let us know if you can relate the question to the paragraph directly. The two sentences are about energy and how it is obtained. But neither the question nor the options have any similar text in the paragraph.

So the conclusion is, in most cases, you will not get direct answers from the passage. You will get only an idea about the concept. If you know it, you can answer it but reading the paragraph even 100 times is not going to help you.

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Chemical Reactions and Equations 14 April, 2021, 6:02 pm
Acids, Bases, and Salts 14 April, 2021, 6:02 pm
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Carbon and its Compounds 14 April, 2021, 6:02 pm
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NCERT Solutions for Class 10 Science Chapter 2 Acids, Bases and Salts

Study Reference for Class 10 Chapter 2 Acids, Bases and Salts

Chapter 2 Acids, Bases and Salts Class 10 NCERT Solutions

Ncert solutions for class 10 science chapters:.

Why does tooth decay start when the pH of mouth is lower than 5.5?

What would be the colour of litmus in a solution of sodium carbonate, what is the common name of the compound caocl 2 , what is bleaching powder how is it prepared , contact form.

NCERT Solutions
NCERT Solutions for Class 10
NCERT Class 10 Science
Chapter 2 Acid Bases And Salts

NCERT Solutions for Class 10 Science Chapter 2 Acids, Bases and Salts

Ncert solutions for class 10 science chapter 2 – cbse get free pdf.

NCERT Solutions for Class 10 Science Chapter 2 Acids, Bases and Salts are prepared to help students in their CBSE exam preparation. This solution provides them with answers to the questions provided in the NCERT Class 10 textbooks. To score better marks in Class 10 Science examination, students should get well-versed with the NCERT Solutions for Class 10 Science provided here.

Download Exclusively Curated Chapter Notes for Class 10 Science Chapter – 2 Acids, Bases and Salts

Download most important questions for class 10 science chapter – 2 acids, bases and salts.

In this chapter, students will learn about the nature and behaviour of acids, bases and salts. This chapter mainly describes the chemical nature of acids, bases and salts and their reaction with metals, non-metals and with each other. It’s highly suggested that students make use of the NCERT Solutions for Class 10 Science Chapter 2 while learning the main concepts. Also, this chapter is quite interesting as it involves many practical experiments to help learners understand the basics.

Every year, 3-4 questions from this chapter are asked in the Class 10 examination. This is also one of the important chapters, as the chances of scoring full marks on questions from this chapter are more. Hence, students are advised to practise all questions of this chapter using these NCERT Solutions for Class 10 Science. Access the NCERT Solutions of Class 10 Science of this chapter from the link given below.

Practical-based multiple choice questions and subjective-based questions are regularly asked in previous year question papers.

Chapter 1 Chemical Reactions and Equations
Chapter 3 Metals and Non-metals
Chapter 4 Carbon and Its Compounds
Chapter 5 Periodic Classification of Elements
Chapter 6 Life Processes
Chapter 7 Control and Coordination
Chapter 8 How Do Organisms Reproduce?
Chapter 9 Heredity and Evolution
Chapter 10 Light Reflection and Refraction
Chapter 11 The Human Eye and Colourful World
Chapter 12 Electricity
Chapter 13 Magnetic Effects of Electric Current
Chapter 14 Sources of Energy
Chapter 15 Our Environment
Chapter 16 Management of Natural Resources

NCERT Solutions for Class 10 Science Chapter 2 Acid Bases and Salts

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NCERT Solutions for Class 10 Science Chapters

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Access Answers to NCERT Class 10 Science Chapter 2 – Acids, Bases and Salts

In-text questions set 1 —> Page number 18

1. You are given three test tubes. The three test tubes contain distilled water, an acidic solution and the basic solution, respectively. There is only red litmus paper available in order to identify what is there in each test tube. How will you find out what is in each of the test tubes?

Solution: We can identify the content in each of the test tubes using red litmus paper. This can be done by noticing the colour change of the red litmus paper.

On litmus paper, the three solutions in the test tubes are poured separately.
The solution which turns red litmus to blue contains a basic solution.
Divide the formed blue litmus paper into two parts.
The solution from the test tube, which turns blue litmus paper to red, will be the acidic solution.
The solution of the test tube, which does not change either red or blue litmus paper, contains water.

NOTE: After immediate distillation, distilled water has a pH of 7. However, within a few hours after distillation, it absorbs carbon dioxide from the atmosphere and turns slightly acidic with a pH of 5.8.

In-text questions set 2 —> Page number 22

1. Why should curd and sour substances not be kept in brass and copper vessels?

Solution: Curd and sour food substances contain acids; these acidic substances combine with metal. This reaction turns food into poison, which damages people’s health.

2. Which gas is usually liberated when an acid reacts with a metal? Illustrate with an example. How will you test for the presence of this gas?

Solution: When an acid reacts with any metal, salt and hydrogen gas are formed.

Metal + Acid → Salt + Hydrogen gas

3. Metal compound A reacts with dilute hydrochloric acid to produce effervescence. The gas evolved extinguishes a burning candle. Write a balanced chemical equation for the reaction if one of the compounds formed is calcium chloride.

Solution: As the metal compound released is Calcium Chloride, the gas evolved here is CO 2 . Hence, metal A should be Calcium Carbonate. Hence, the reaction between Calcium Carbonate and HCl is

CaCO 3 (s) + 2HCl (Aq) → CaCl 2 ( Aq) + CO 2 (g) + H 2 O (l)

In-text questions set 3 Page number – 25

1. Why do HCl, HNO3, etc., show acidic characters in aqueous solutions while solutions of compounds like alcohol and glucose do not show an acidic character?

Solution: Release of H + ion in water will make a compound acidic or non-acidic. Acids are substances which, upon dissociating with water, resulting in the production of Hydrogen ions. Some compounds show an acidic character as they dissociate in the aqueous solution, which results in the production of hydrogen ions (acids like HCl, HNO 3 ).

Compounds similar to glucose or alcohol do contain a hydrogen element, but they do not show signs of acidic nature. The fact is that the hydrogen in them will not separate from like the hydrogen in the acids. They will not separate to become hydrogen ions, on dissolving in the water.

2. Why does an aqueous solution of acid conduct electricity?

Solution: Charged particles are responsible for the conductance of electricity in an acid. These charged particles, called ions, are the reason behind the conductance of electricity in acid.

3. Why does dry HCl gas not change the colour of the dry litmus paper?

Solution: HCl does not give out Hydrogen ions; therefore, HCl does not show any acidic behaviour, and the colour of the litmus paper remains the same on reacting with HCl gas.

4. While diluting an acid, why is it recommended that the acid should be added to water and not water to the acid?

Solution: While diluting an acid, it is recommended that the acid should be added to water and not water to the acid because if water is added to a concentrated acid, it releases a huge amount of heat which may result in an explosion and can cause acid burns on the face, clothes and body parts. Hence, it is safe to add acid to water but not water to acid.

5. How is the concentration of hydronium ions (H 3 O + ) affected when a solution of an acid is diluted?

Solution: When acid is added to water, there will be a fixed amount of hydronium present in the fixed volume of the solution. If we dilute the solution, hydronium ions per volume of the solution decrease, and this, in turn, decreases Hydronium concentration in the solution.

6. How is the concentration of hydroxide ions (OH – ) affected when excess base is dissolved in a solution of sodium hydroxide?

Solution: When a base is dissolved in sodium hydroxide solution, its hydroxide ions increase, but it will reach saturation at some point. After saturation point, hydroxide ion concentration is not affected even after adding base further.

In-text questions set 4 Page number – 33

1. You have two solutions, A and B. The pH of solution A is 6, and the pH of solution B is 8. Which solution has more hydrogen ion concentration? Which of these is acidic, and which one is basic?

Solution: In order to find the hydrogen ion concentration, we can use the rule that states, “The pH of any solution is inversely proportional to the hydrogen ion concentration.” Therefore, it means that the solution that has a lower pH number will have a higher hydrogen ion concentration. Hence, solution A will have a higher hydrogen ion concentration. In addition, solution B will be basic, and A will be acidic.

2. What effect does the concentration of H + (aq) ions have on the nature of the solution?

Solution: Hydrogen ion concentration decides the nature of the solution. If Hydrogen ion concentration increase, then the solution turns acidic and similarly, if Hydrogen ion concentration decreases, then the solution turns basic.

3. Do basic solutions also have H +( aq) ions? If yes, then why are these basic?

Solution: Basic solutions have H + ions, but hydroxide ions present in basic solution are more in basic solution. Hence, Hydroxide ions turn the solution into basic.

4. Under what soil condition do you think a farmer would treat the soil of his fields with quick lime (calcium oxide) or slaked lime (calcium hydroxide), or chalk (calcium carbonate)?

Solution: If the soil is acidic in nature (PH below 7), then such fields should be treated with quick lime (calcium oxide) or slaked lime (calcium hydroxide) or chalk (calcium carbonate).

In-text questions set 5 Page number – 34-35

1. What is the common name of the compound CaOCl 2 ?

Solution: The common name of CaOCl 2 is bleaching powder.

2. Name the substance, which on treatment with chlorine, yields bleaching powder.

Solution: The substance, which on treatment with chlorine, yields bleaching powder is Calcium hydroxide.

3. Name the sodium compound which is used for softening hard water.

Solution: Sodium carbonate is the compound which is used for softening hard water.

4. What will happen if a solution of sodium hydrocarbonate is heated? Give the equation of the reaction involved.

Solution: Heating sodium hydrocarbonate yields sodium carbonate, and carbon dioxide gas is liberated in the process.

ncert solutions class 10 science chapter 2-1

5. Write an equation to show the reaction between Plaster of Paris and water.

Solution: The chemical equation for the reaction of Plaster of Paris and water is

CaSO 4 .1/2H 2 O + 3/2H 2 O → CaSO 4 .2H 2 O

Exercise questions Page number – 33

1. A solution turns red litmus blue, its pH is likely to be

a) 1 (b) 4 (c) 5 (d) 10

Solution: The answer is 10 because litmus paper turns blue when the solution reacts with a basic solution (PH more than 7). Hence, 10 is the answer.

2. A solution reacts with crushed eggshells to give a gas that turns lime-water milky. The solution contains

a) NaCl (b) HCl (c) LiCl (d) KCl

Solution: The answer is HCl.

Eggshells contain calcium carbonate, which on reaction with HCl, liberates CO 2 gas, which turns lime water into milky.

CaCO 3 + 2HCl → CaCl 2 + H 2 O + CO 2

3. 10 mL of a solution of NaOH is found to be completely neutralised by 8 mL of a given solution of HCl. If we take 20 mL of the same solution of NaOH, the amount of HCl solution (the same solution as before) required to neutralise it will be

(a) 4 mL (b) 8 mL (c) 12 mL (d) 16 mL

Solution: Since 10 ml of NaOH requires 8 mL of HCL, 20 ml of NaOH requires 8 x 2 = 16mL of HCl. Hence, the answer is option (d) 16mL.

4. Which one of the following types of medicines is used for treating indigestion?

(a) Antibiotic (b) Analgesic (c) Antacid (d) Antiseptic

Solution: Indigestion is due to the excess production of acid in the stomach. Medicines used to treat indigestion is called Antacid.

5. Write word equations and then balanced equations for the reaction taking place when

(a) Dilute sulphuric acid reacts with zinc granules.

(b) Dilute hydrochloric acid reacts with magnesium ribbon.

(d) Dilute hydrochloric acid reacts with iron filings.

=> Dilute sulphuric acid + zinc → Zinc Sulphate + Hydrogen Gas

=> H 2 SO 4 (aq) + Zn → ZnSO 4 (aq) + H 2 (g)

=> Dilute Hydrochloric + Magnesium → Magnesium Chloride + Hydrogen Gas

=> 2HCl(aq) + Mg → MgCl 2 (aq) + H 2 (g)

=> Dilute Sulphuric Acid + Aluminium → Aluminium Sulphate + Hydrogen Gas

=> 3H 2 SO 4 (aq) + 2Al(s) → Al 2 (SO 4 ) 3 (aq) + 3H 2 (g)

=> Dilute Hydrochloric Acid + Iron → Ferrous Chloride + Hydrogen Gas

=> 6HCl(aq) + 3Fe(s) → 3FeCl 2 (aq) + 3H 2 (g)

6. Compounds such as alcohols and glucose also contain hydrogen but are not categorised as acids. Describe an activity to prove it.

Solution: Insert two nails into the wooden or rubber cork and place them on a beaker, as shown in the figure. Connect the iron nail to a bulb, a 6-volt battery and a wire connected to the switch. Pour some alcohol or glucose so as to dip the nails in glucose or alcohol. Turn the switch on, and you see the bulb not glowing despite of connection to the switch. Now empty the beaker and add the HCL solution. This time, the bulb glows. This proves acid can conduct electricity, but alcohol and glucose do not conduct electricity.

ncert solutions class 10 science chapter 2-2

7. Why does distilled water not conduct electricity, whereas rain water does?

Distilled water does not contain any ionic compounds in it.
Whereas rainwater has a lot more compounds.
Rainwater has dissolved acidic gas, such as carbon dioxide from the air, and that forms carbonic acid. This means that it has hydrogen ions and carbonate ions. Therefore, with the presence of acids, rainwater can conduct electricity.

8. Why do acids not show acidic behaviour in the absence of water?

Solution: The acidic behaviour of acids is because of the presence of hydrogen ions. Hydrogen ions can only be produced in the presence of water, and therefore, water is definitely needed if acids are to show their acidic behaviour.

9. Five solutions, A, B, C, D and E, when tested with a universal indicator, showed pH as 4, 1, 11, 7 and 9, respectively. Which solution is

(a) Neutral?

(b) Strongly alkaline?

(d) Weakly acidic?

(e) Weakly alkaline?

Solution: In increasing order of hydrogen ion concentration,

pH 11(C) < pH 9(E) < pH 7 (D) < pH 4 (A) < pH 1 (B)

PH11 – Strongly alkaline

pH9 – Weakly alkaline

PH7 – Neutral

pH4 – Weakly acidic

pH1 – Strongly acidic

10. Equal lengths of magnesium ribbons are taken in test tubes A and B. Hydrochloric acid (HCl) is added to test tube A, while acetic acid (CH 3 COOH) is added to test tube B. Amount and concentration taken for both the acids are the same. In which test tube will the fizzing occur more vigorously and why?

Solution: HCl is a strong acid, whereas acetic is a weaker acid. Fizzing occurs because of the production of the hydrogen gas obtained due to the reaction of the acid on the magnesium ribbon. Since HCl is a very strong acid, there is a lot of liberation of hydrogen gas from test tube A. Therefore, more fizzing takes place in test tube A.

11. Fresh milk has a pH of 6. How do you think the pH will change as it turns into curd? Explain your answer.

Solution: Fresh milk is turned to curd due to the production of lactic acid. Lactic acid reduces the pH of the milk.

12. A milkman adds a very small amount of baking soda to fresh milk.

(a) Why does he shift the pH of the fresh milk from 6 to slightly alkaline?

(b) Why does this milk take a long time to set as curd?

Solution: (a) He shifted the pH of the fresh milk from 6 to slightly alkaline to prevent milk from getting sour due to the production of lactic acid.

(b) This milk takes a long time to set into curd because the lactic acid produced here first neutralises the pH, and then the pH is reduced to turn the milk into curd.

13. Plaster of Paris should be stored in a moisture-proof container. Explain why.

Solution: Plaster of Paris should be stored in a moisture-proof container because moisture can affect the Plaster of Paris by slowing down the setting of the plaster because of hydration. This will turn plaster useless.

14. What is a neutralisation reaction? Give two examples.

Solution: The reaction of the acid + base gives a product of salt + water, which is considered a neutralisation reaction.

NaOH + HCl → NaCl + H 2 O

Mg(OH) 2 + H 2 CO 3 → MgCO 3 + 2H 2 O

15. Give two important uses of washing soda and baking soda.


1. It is used as an electrolyte	1. It can be used to test the garden soil for acidity. If bubbles are developed, then the soil is too acidic
2. It can be used domestically as a water softener for laundry.	2. If used on washing the car, then it will remove dead bug bodies without damaging the colour or the paint on the car.

Topics included in NCERT Class 10 Science Chapter 2 – Acid, Bases and Salts

Understanding the chemical properties of bases and acids
How do acids and bases react with metals?
How do metal carbonates and metal hydrogen carbonates react with acids?
How do acids and bases react with each other?
The reaction of metallic oxides with acids
The reaction of non–metallic oxide with base
What do all acids and bases have in common?
What happens to an acid or base in a water solution?
How strong are acid or base solutions?
Importance of pH in everyday life
More about salts
Family of salts
pH of salts
Chemicals from common salt

NCERT Solutions for Class 10 Chapter 2 Science Acids, Bases and Salts

In this chapter, students will get a hold of basic knowledge of acids, bases and salts. Students can further learn by accessing the Class 10 NCERT Solutions , the various chemical properties of acids, bases and salts and their reaction with metals and non-metals.

Features of NCERT Solutions for Class 10 Chapter 2 Science Acids, Bases and Salts

There are a lot of practical-based questions in this solution, and these types of questions are often asked in CBSE Class 10 Science examination.
Students will encounter questions on day-to-day examples of acids, bases and salts.
One can perceive different kinds of reactions involved with acids, bases and salts.

Students can also access NCERT Solutions for Classes 1 to 12 of any subject to learn and revise key concepts at any time.

BYJU’S is India’s top education technology company that believes in a modern learning approach. Our resource materials include NCERT notes, books, animations, videos, info-graphics, NCERT exemplar solutions, sample papers and NCERT Solutions . Our study materials will not only help students understand the topic completely but also help them memorising the topic for a longer period of time.

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Chapter 2 Class 10 - Acids, Bases and Salts

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Chapter 2 of Class 10, Acids, Bases and Salts, is going to teach you about the nature of solutions and various products that we use on a daily basis. These products or solutions are categorised into 2 categories which are acids and bases.

We, at Teachoo , will provide you with all the necessary sources such as concepts , NCERT questions along with extra questions made by our experts which will help you in clarifying all the concepts easily.

Firstly, you are going to learn about various strength tests which will help you check the power of a solution, both acidic and basic. The tests you are going to learn about are -

Litmus Paper test
pH scale test

Secondly, you are going to understand various reactions which occur when acidic and basic solutions are combined with each other. You will also learn about the reactions of acids and bases with metals.

Lastly, you will look at the category of Salts and their chemical properties as well as their uses in our day to day lives.

NCERT Questions

Questions from inside the book, teachoo questions, case based questions (mcq), assertion reasoning questions (mcq), mcq from past year papers, mcqs from ncert exemplar.

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Extra Questions for Class 10 Science Chapter 2 Acids, Bases And Salts

Get extra questions for Class 10 Science Chapter 2 Acids, Bases And Salts with PDF. Our subject expert prepared these solutions as per the latest NCERT textbook. These extra questions will be helpful to revise the important topics and concepts. You can easily download all the questions and answers in PDF format from our app.

Acids, Bases And Salts Class 10 Science Extra Questions with Answers

Question 1: The pH of a sample of vegetable soup was found to be 6.5. How is this soup likely to taste?

Answer: The taste will be slightly sour as it is weakly acidic.

Question 2: Which bases are called alkalies? Give an example of alkalies.

Answer: Soluble bases are called alkalies, e.g. sodium hydroxide (NaOH).

Question 3: Write a balanced chemical equation for the reaction between sodium carbonate and hydrochloric acid indicating the physical state of the reactants and the products.

Answer: Na 2 CO 3 (s) + 2HCl(aq) → 2NaCl(aq) + CO 2 (g) + H 2 O(l)

Question 4: Write a balanced chemical equation for a neutralisation reaction, mentioning the physical state of the reactants and the products.

Answer: NaOH(s) + 2HCl(aq) → NaCl(aq) + H 2 O(l)

Question 5: What would be the colour of red litmus in a solution of sodium carbonate?

Answer: The red litmus will change to blue in sodium carbonate solution.

Question 6: Which gas is evolved when sodium hydrogencarbonate reacts with dilute hydrochloric acid?

Answer: Carbon dioxide gas is evolved.

Question 7: Curd is not kept in copper and brass utensils. Why?

Answer: Curd and sour substances contain acids which react with brass and copper vessels to form poisonous salts which are harmful for our health.

Question 8: Name the gas usually liberated when a dilute acid reacts with a metal. What happens when a burning candle is brought near this gas?

Answer: H 2 gas is liberated. It burns with pop sound when burning candle is brought near the gas.

Question 9: What effect does an increase in concentration of H + (aq.) in a solution have on the pH of solution?

Answer: Higher the concentration, lower will be pH of the solution.

Question 10: Why does 1 M HC1 solution have a higher concentration of H+ ions than 1 M CH 3 COOH solution?

Answer: 1 M HCl has higher cone, of (H+) because it ionises completely in aqueous solution whereas CH 3 COOH does not as it is weak acid.

Question 11: Which gas is generally liberated when a dilute solution of hydrochloric acid reacts with an active metal?

Answer: Hydrogen gas is liberated when active metal reacts with dilute hydrochloric acid.

Zn(s) + 2HCl (dil.) → ZnCl 2 (aq) + H 2 (g)

Question 12: What is the colour of litmus in a solution of ammonium hydroxide?

Answer: Red litmus will turn blue in ammonium hydroxide.

Question 13: How will you test for the gas which is liberated when hydrochloric acid reacts with an active metal?

Answer: Bring a burning matchstick near the gas. It burns with ‘pop’ sound showing that it is hydrogen.

Question 14: Name the acid present in the following: (i) Tomato (ii) Vinegar (iii) Tamarind

Answer: (i) Oxalic acid (ii) Acetic acid (iii) Tartaric acid

Question 15: mL of water and 10 mL of sulphuric acid are to be mixed in a beaker (i) State the method that should be followed with reason. (ii) What is this process called?

Answer: (i) The acid is to be added slowly in water to prevent the mixture to be splashed. The reaction is highly exothermic therefore, constant cooling should be done.

(ii) The process is called dilution.

Question 16: Explain how antacid works.

Answer: Hyperacidity is caused by excess of hydrochloric acid in stomach. Antacid is basic in nature. It neutralizes excess of acid and gives relief from pain caused by hyperacidity.

Question 17: Name the natural source of each of the following acid (i) Citric acid. (ii) Oxalic acid. (iii) Lactic acid. (iv) Tartaric acid.

Answer: (i) Lemon and orange. (ii) Tomatoes and Guava. (iii) Sour milk (curd) (iv) Tamarind.

Question 18: A student detected the pH of four unknown solution A, B, C and D as follows 11, 5, 7 and 2. Predict the nature of the solution.

Answer: A is basic ‘B’ is acidic ‘C’ is natural and ‘D’ is strongly acidic.

Question 19: State the chemical name of Plaster of Paris. Write a chemical equation to show the reaction between Plaster of Paris and water.

Answer: Calcium sulphate hemihydrate.

Question 20: State in brief the preparation of washing soda from baking soda. Write balanced chemical equation of the reaction involved.

Answer: Sodium hydrogencarbonate (baking soda) on heating gives sodium carbonate which on recrystallisation gives washing soda.

Class 10 Chapter 2 Acids Bases and Salts Extra Question 20

Question 21: What is the colour of FeSO 4 .7H 2 O crystals? How does this colour change upon heating? Give balanced chemical equation for the changes.

Answer: Pale green is the colour of FeSO 4 .7H 2 O crystals. It becomes dirty white on heating.

Class 10 Chapter 2 Acids Bases and Salts Extra Question 21

Question 22: Classify the following salts into acidic, basic and neutral: Potassium sulphate, ammonium chloride, sodium carbonate, sodium chloride.

Answer: Neutral: Potassium sulphate, Sodium chloride

Acidic: Ammonium chloride

Basic: Sodium carbonate

Question 23: A student dropped few pieces of marble in dilute HC1 contained in a test tube. The evolved gas was passed through lime water.

(i) What change would be observed in lime water?

(ii) Write balanced chemical equation for the above change.

Answer: (i) Lime water will turn milky due to formation of calcium carbonate.

(ii) Ca(OH) 2 (aq) + CO 2 (g) → CaCO 3 (s) + H 2 O(l)

Question 24: What happens when chlorine is passed over slaked lime at 313K? Write chemical equation of the reaction involved and state two uses of the product obtained.

Answer: Bleaching powder is formed.

(i) It is used as bleaching agent in paper and textile industries. (ii) It is used as disinfectant in purification of drinking water

Question 25: What is meant by ‘water of crystallisation’ of a substance?

Answer: The water molecules associated with a crystalline substance is called ‘water of crystallisation’.

Question 26: (a) Define olfactory indicators. Name two substances which can be used as olfactory indicator. (b) Choose strong acids from the following: CH 3 COOH, H 2 SO 4 , H 2 CO 3 , HNO 3

Answer: (a) Those substances whose smell (odour) changes in acidic or basic solution are called olfactory indicators, e.g. onion and vanilla.

(b) H 2 SO4 and HNO 3 are strong acids.

Question 27: Explain the action of dilute hydrochloric acid on the following with chemical equation: (i) Magnesium ribbon (ii) Sodium hydroxide (iii) Crushed egg shells

Answer: (i) Hydrogen gas will be formed Mg(s) + 2HCl (dil) → MgCl 2 (aq) + H 2 (g)

(ii) Sodium chloride and water will be formed NaOH + HCl → NaCl + H 2 O

(iii) Crushed egg shell are made up of CaCO 3 which reacts with dil HCl to give brisk effervescence due to CO 2 CaCO 3 (s) + 2HCl CaCl 2 + H2O + CO 2

Question 28: (i) Give the constituents of baking powder (ii) Why cake or bread swells on adding baking powder? Write chemical equation.

Answer: (i) Baking powder containing sodium hydrogen carbonate and tartaric acid. (ii) It is due to carbon dioxide

Question 29: (a) Write the name given to bases that are highly soluble in water. Give an example. (b) How is tooth decay related to pH? How can it be prevented? (c) Why does bee sting cause pain and irritation? Rubbing of baking soda on the sting area gives relief. How?

Answer: (a) Alkali, e.g. NaOH (Sodium hydroxide).

(b) Lower the pH, more will be tooth decay. Acid reacts with Ca3(PO4)2 and cause tooth decay. It can be prevented by brushing teeth after every meal.

Question 30: A white powder is added while baking breads and cakes to make them soft and fluffy. Write the name of the powder. Name its main ingredients. Explain the function of each ingredient. Write the chemical reaction taking place when the powder is heated during baking.

Answer: Baking powder. It consists of sodium hyrogencarbonate and tartaric acid. Sodium hydrogencarbonate gives CO 2 which makes cake soft and fluffy. Tartaric acid neutralizes the bitterness due to sodium carbonate produced.

Question 31: “Sodium hydrogencarbonate is a basic salt”. Justify the statement. How is it converted into washing soda? Explain.

Answer: Sodium hydrogencarbonate is a salt of sodium hydroxide (strong base) and carbonic acid (weak acid). It is basic salt. It is converted into washing soda by heating followed by crystallization.

Question 32: (a) What is universal indicator? (b) Write the chemical equation involved in the preparation of sodium hydroxide. Name the process.

Answer: (a) Universal indicator is the mixture of synthetic indicators which is used to find pH of solutions.

Class 10 Chapter 2 Acids Bases and Salts Extra Question 32

Question 33: A gas ‘X’ reacts with lime water and forms a compound ‘Y’ which is used as a bleaching agent in chemical industry. Identify ‘X’ and ‘Y\ Give the chemical equation of the reactions involved.

Class 10 Chapter 2 Acids Bases and Salts Extra Question 33

Question 34: (i) Name the compound which is obtained from baking soda and is used to remove permanent hardness of water. (ii) Write its chemical formula. (iii) What happens when it is recrystallised from its aqueous solution?

Answer: (i) Sodium carbonate is obtained from baking soda and is used to remove hardness of water. (ii) Na 2 CO 3 (iii) It changes to washing soda, Na 2 CO 3 .10H 2 O

Question 35: What is a neutralisation reaction? Give two examples.

Answer: The reaction between acid and base to form salt and water is called neutrilisation reaction. Examples: KOH + HNO 3 → KNO 3 + H 2 O 2NaOH + H 2 SO 4 → Na 2 SO 4 + 2H 2 O

Question 36: What is tooth enamel chemically? State the condition when it starts corroding. What happens when food particles left in the mouth after eating degrade? Why do doctors suggest use of tooth powder/toothpaste to prevent tooth decay?

Answer: It is made up of calcium phosphate. It starts corroding due to acid formed in mouth. The food particles which are left in mouth form acids which cause tooth decay. Toothpaste and tooth powder are basic and neutralise acid formed in mouth which prevents tooth decay.

Question 37: What is Plaster of Paris chemically? How is it prepared? List its two important uses.

Answer: Calcium sulphate hemihydrate. It is prepared by heating gypsum at 373 K.

Class 10 Chapter 2 Acids Bases and Salts Extra Question 37

(i) It is used to prepare chalks. (ii) It is used to make casts and moulds.

Question 38: What is baking soda chemically called? Give reaction involved in its preparation. Write one of its uses.

Answer: Sodium hydrogencarbonate. NH 3 + CO 2 + H 2 O + NaCl → NaHCO 3 + NH 4 Cl OR NaCO 3 + CO 2 + H 2 O → 2NaHCO 3 It is used as an antacid.

Question 39: (a) What is an alkali? Give an example. (b) Why do HCl, HNO 3 , etc. show acidic characters in aqueous solutions while solutions of compounds like alcohol and glucose do not show acidic character?

Answer: (a) Soluble bases are called alkalies, e.g. sodium hydroxide is an alkali.

(b) HCl, HNO 3 ionise in aqueous solution, whereas alcohol and glucose do not show acidic characters because they do not ionise in aqueous solution.

Question 40: A compound which is prepared from gypsum has the property of hardening when mixed with proper quantity of water. (i) Identify the compound. (ii) Write the chemical equation for its preparation. (iii) Mention one important use of this compound.

Answer: (i) Plaster of Paris

Class 10 Chapter 2 Acids Bases and Salts Extra Question 40

(iii) It is used for plastering fractured bones.

Question 41: Name the products formed in each case when (a) hydrochloric acid reacts with caustic soda. (b) granulated zinc reacts with caustic soda. (c) carbon dioxide is passed into lime water.

Class 10 Chapter 2 Acids Bases and Salts Extra Question 41

Question 42: State reason for the following statements: (i) Tap water conducts electricity whereas distilled water does not. (ii) Dry hydrogen chloride gas does not turn blue litmus red whereas dilute hydrochloric acid does. (iii) During summer season, a milk man usually adds a very small amount of baking soda to fresh milk. (iv) For a dilution of acid, acid is added into water and not water into acid. (v) Ammonia is a base but does not contain hydroxyl group.

Answer: (i) Tap water contains ions which conduct electricity, distilled water does not contain ions.

(ii) Dry HCl does not form ions but HCl gives H + and Cl – .

(iii) Baking soda does not allow milk to change to lactic acid which makes milk sour.

(iv) Adding water to acid is highly exothermic. Therefore, water is added to acid very slowly with cooling.

(v) Ammonia dissolves in water and forms H – Therefore, it is basic in nature.

Question 43: (a) State the chemical properties on which the following uses of baking soda are based: (i) as an antacid (ii) as a soda acid fire extinguisher (iii) to make bread and cake soft and spongy. (b) How is washing soda is obtained from baking soda? Write balanced chemical equation.

Answer: (a) (i) It is weakly basic in nature and naturalize hyperacidity. (ii) It liberates CO 2 with H 2 SO 4 , which extinguish fire. (iii) It liberates CO 2 on heating which makes bread and cake soft and sponge

Baking soda on heating gives sodium carbonate which on crystallisation from hydrated washing soda.

Na 2 CO 3 + 10H 2 O → Na 2 CO 3 .10H 2 O

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Acids, bases, and salts notes | class 10 science chapter 2.

Certainly! Here are some detailed notes on the chapter "Acids, Bases, and Salts" from the NCERT Class 10 Science textbook:

Introduction

Acids : Acids are substances that release hydrogen ions ( H + H^+ H + ) in aqueous solution. They have a sour taste and turn blue litmus paper red.
Bases : Bases are substances that release hydroxide ions ( O H − OH^- O H − ) in aqueous solution. They have a bitter taste and turn red litmus paper blue.

Properties of Acids:

Taste : Sour taste.
Effect on Litmus : Turns blue litmus paper red.
Reaction with Metals : Acids react with active metals to produce hydrogen gas. Example: 2HCl + Zn → ZnCl 2 + H 2 \text{Example: } \text{2HCl} + \text{Zn} \rightarrow \text{ZnCl}_2 + \text{H}_2
Reaction with Metal Carbonates and Bicarbonates : Acids react with metal carbonates and bicarbonates to produce carbon dioxide gas. Example: 2HCl + Na 2 CO 3 → 2NaCl + CO 2 + H 2 O \text{Example: } \text{2HCl} + \text{Na}_2\text{CO}_3 \rightarrow \text{2NaCl} + \text{CO}_2 + \text{H}_2\text{O}

Properties of Bases:

Taste : Bitter taste.
Effect on Litmus : Turns red litmus paper blue.
Reaction with Fats and Oils : Bases react with fats and oils to form soap. Example: NaOH + H 3 CCO 2 H → Soap + Water
Indicators : Substances that change color in the presence of acids or bases.
Examples : Litmus, phenolphthalein, methyl orange.
pH Scale : A scale used to measure the acidity or basicity of a solution.
pH Values :
pH < 7 indicates an acidic solution.
pH = 7 indicates a neutral solution.
pH > 7 indicates a basic (alkaline) solution.

Importance of pH in Everyday Life

Acid Rain : Harmful effects of acid rain on plants, buildings, and aquatic life.
pH in Soil : Importance of pH in determining soil fertility and plant growth.
pH in Human Body : Importance of maintaining pH balance in the blood and digestive system.
Formation : Salts are formed by the reaction between acids and bases.
Properties : Salts may be acidic, basic, or neutral depending on the nature of the acids and bases involved in their formation.
Examples : NaCl , CaCO 3 , CuSO

Uses of Salts

Food Preservation : Use of salts like sodium chloride (table salt) for preserving food.
Healthcare : Use of salts in medicines and healthcare products.
Industry : Use of salts in industries such as textile, leather, and glass.

Preparation of Salts

Methods : Preparation of salts by neutralization reactions.
Example : Preparation of CuSO 4 \text{CuSO}_4 from CuO \text{CuO} and H 2 SO 4 \text{H}_2\text{SO}_4 H 2 .
Understanding acids, bases, and salts is crucial for understanding various chemical reactions in daily life, industrial processes, and environmental impacts.

These notes cover the essential concepts and applications of acids, bases, and salts as taught in Class 10 Science. They provide a comprehensive overview of the chapter, helping students grasp both theoretical and practical aspects of these substances.

Certainly! The NCERT Class 10 Science textbook typically includes chapters covering various topics in physics, chemistry, and biology. Here's a list of chapters commonly found in the NCERT Class 10 Science book:

Chemical Reactions and Equations
Acids, Bases, and Salts
Metals and Non-Metals
Carbon and its Compounds
Periodic Classification of Elements
Life Processes
Control and Coordination
How do Organisms Reproduce?
Heredity and Evolution
Light - Reflection and Refraction
The Human Eye and the Colourful World
Electricity
Magnetic Effects of Electric Current
Sources of Energy
Our Environment
Management of Natural Resources

These chapters cover fundamental concepts in science for Class 10 students and are structured to provide a comprehensive understanding of each topic.

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Case Study Questions Class 10 Science Acids, Bases and Salts

CBSE Case Study Questions Class 10 Science Acids, Bases and Salts

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Class 10 Science: Case Study Chapter 2 Acids, Bases, and Salts PDF Download

Case Study Chapter 2 Acids, Bases, and Salts

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Case Study Chapter 2 Acids Bases Salts

Case Study Questions Chapter 2 Acids Bases Salts

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Q2: Why are case study questions important for understanding class 10 science chapters?

Q3: How should students approach answering case study questions for CBSE?

Q4: Are there any resources available online for students to practice case study questions on class 10 science chapters for CBSE exams?

Q5: How can students effectively prepare for case study questions on chemical reactions and equations for CBSE exams?

Q6: How can teachers incorporate case study questions on acids, bases and salts class 10 science into classroom teaching?

Q7: What is an acid?

Q8: What are the properties of acids?

Q9: How do acids react with metals? Give examples.

Q10: What is a base?

Q11: What are the properties of bases?

Q12: Differentiate between acids and bases based on their taste, effect on litmus paper, and chemical behavior.

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NCERT Solutions for Class 10 Science Chapter 2 Acids, Bases and Salts

Chapter 2 Acids, Bases and Salts Class 10 NCERT Solutions

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NCERT Solutions for Class 10 Science Chapter 2 Acids, Bases and Salts

Download Exclusively Curated Chapter Notes for Class 10 Science Chapter – 2 Acids, Bases and Salts