Chemical Reactions And Equations MCQs | Class 10 Science Chapter 1 Quiz

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Are you preparing for CBSE Class 10 Science Chapter 1 – Chemical Reactions and Equations? Test your knowledge with these MCQs based on the latest NCERT syllabus. This quiz will help you revise important concepts like types of chemical reactions, balancing equations, and oxidation-reduction reactions. Attempt the quiz now and check your score instantly!

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Class 10 Science Chapter 1 Chemical Reactions and Equations MCQs

Chapter 1: Chemical Reactions and Equations

1 / 15

Electrolysis of water is a decomposition reaction. The mole ratio of hydrogen and oxygen gases liberated during the electrolysis of water is

4:1

1:1

2:1

1:2

2 / 15

Which of the following reaction(s) is an endothermic reaction?

Decomposition of vegetable matter into compost

Burning of coal

Process of respiration

Decomposition of calcium carbonate to form quick lime and carbon dioxide.

3 / 15

Which of the following are exothermic processes?

Reaction of water with quick lime
Dilution of an acid
Evaporation of water
Sublimation of camphor (crystals)

2 and 3

1 and 4

3 and 4

1 and 2

4 / 15

Assertion (A): Following is a balanced chemical equation for the action of steam on iron:

3Fe + 4H₂0 → Fe₃O₄ + 4H₂

Reason (R): The law of conservation of mass holds good for a chemical equation.

(A) is false, but (R) is true.

(A) is true, but (R) is false

Both (A) and (R) are true and (R) is the correct explanation of the assertion.

Both (A) and (R) are true, but (R) is not the correct explanation of the assertion.

5 / 15

Sunita takes about 2 g ferrous sulphate crystals in a dry boiling tube and heats the boiling tube over the flame of a burner or spirit lamp as shown in the figure.

chemical reactions and equations questions and answers

The color of crystals after heating is:

Green

Orange

Brown

Black

6 / 15

A small amount of copper powder is heated as shown in the figure.

chemical reactions and equations class 10

Which reaction shows the above reaction?

4Cu + O2 → 2Cu2O

2Cu + O2 → 2CuO

None of the above

CuO + H2 → Cu + H2O

7 / 15

Assertion (A): While equalizing the number of atoms to balance a chemical equation, we alter the formula of the compounds or elements involved in the reaction.

Reason (R): A chemical equation is balanced by making the number of atoms of each element equal on both sides of the arrow.

(A) is false, but (R) is true.

Both (A) and (R) are true and (R) is the correct explanation of the assertion.

(A) is true, but (R) is false

Both (A) and (R) are true, but (R) is not the correct explanation of the assertion.

8 / 15

Assertion (A): A white-washed wall develops a coating of calcium carbonate after a few days.

Reason (R): Calcium oxide on the wall reacts slowly with carbon dioxide in the air.

Both (A) and (R) are true, but (R) is not the correct explanation of the assertion.

(A) is false, but (R) is true.

Both (A) and (R) are true and (R) is the correct explanation of the assertion.

(A) is true, but (R) is false

9 / 15

The silver chloride is placed under the sunlight as shown in the figure. The color of silver chloride after some time is:

Also See: CBSE Practical Exam Guidelines for Supplementary Exam 2025 (Class 10 & 12)

chemical reactions and equations questions and answer

Black

Yellow

Green

Grey

10 / 15

Which of the following statements about the given reaction are correct?

3Fe + 4H₂O → Fe₃O₄ + 4H₂

1. Iron metal is getting oxidized.

1. Water is getting reduced.

1. Water is acting as a reducing agent.

1. Water is acting as an oxidizing agent.

1, 2, and 3

3 and 4

1, 2, and 4

2 and 4

11 / 15

Identify the endothermic reaction(s) among the following:

1. 6CO₂ + 12H₂O → C₆H₁₂O₆ + 6O₂ + 6H₂O

1. Na₂CO₃ + 2HCl → 2NaCl + CO₂ + H₂O

1. C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O

1. CaCO₃ → CaO + CO₂

Only 4

Only 2 and 3

Only 1 and 4

Only 1

12 / 15

Solid calcium oxide reacts vigorously with water to form calcium hydroxide accompanied by the liberation of heat. This process is called slaking of lime. Which among the following is/are true about slaking of lime?

1. It is an endothermic reaction.

1. It is an exothermic reaction.

1. The pH of the resulting solution will be more than seven.

1. The pH of the resulting solution will be less than seven.

2 and 3

1 and 2

1 and 4

3 and 4

13 / 15

You are given the solution of lead nitrate. In order to obtain a yellow precipitate you should mix with it a solution of ______.

Potassium nitride

Potassium iodide

Potassium sulphide

Potassium chloride

14 / 15

Identify the product which represents the solid state in the above reaction.

chemical reactions and equations questions

Barium sulphate

Sodium chloride

Barium chloride

Sodium sulphate

15 / 15

Assertion (A): In the reaction: MnO₂ + 4HCl → MnCl₂ + 2H₂O + Cl₂

HCl is getting oxidized while MnO₂ is getting reduced.

Reason (R): The process in which oxygen is added to a substance is called oxidation whereas the process in which oxygen is removed from a substance is called reduction.

Both (A) and (R) are true, but (R) is not the correct explanation of the assertion.

(A) is true, but (R) is false

Both (A) and (R) are true and (R) is the correct explanation of the assertion.

(A) is false, but (R) is true.

Your score is

The average score is 57%

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Chemical Reactions and Equations MCQs | Class 10 Science Chapter 1 Quiz

Class 10 Science Chapter 1 Chemical Reactions and Equations MCQs

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Class 10 Science Chapter 1 Chemical Reactions and Equations MCQs

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