Master Class 10 Science – Chemical Reactions and Equations with Our MCQ Mock Test!

Are you confident about balancing equations, identifying types of reactions, and predicting products? Test your knowledge with this exclusive MCQ-based mock test on Chemical Reactions and Equations. Designed as per the Class 10 Science syllabus, this test covers all the key concepts – from different types of chemical reactions (combination, decomposition, displacement, double displacement) to oxidation and reduction, and balancing equations with accuracy.

This mock test will not only help you revise important topics but also give you an exam-like experience that sharpens speed, accuracy, and problem-solving skills. Perfect for practice before school tests, board exams, or quick self-assessment.

Attempt now to check your preparation level and make Chemical Reactions & Equations your strongest chapter!

1. Identify ‘x’, ‘y’ and ‘z’ in the following balanced reaction
xPb(NO3)2(s)  yPbO(s) + zNO2(g) + O2(g)

 
 
 
 

2. Reema took 5 mL of lead nitrate solution in a beaker and added approximately 4 mL of KI solution to it. What would she observe?

 
 
 
 

3. In which of the following chemical equations, the abbreviations represent the correct states of the reactants and products involved at reaction temperature ?

 
 
 
 

4. Which one of the following processes involve chemical reactions ?

 
 
 
 

5.

Direction: In the following Question, the Assertion and Reason have been put forward. Read the statements carefully and choose the correct alternative from the following:
Assertion: A reaction in which a substance is decomposed into two or more substances is known as decomposition reaction.
Reason: The decomposition of a substance is impossible without supplying energy.
 
 
 
 

6. The following reaction is used for the preparation of oxygen gas in the laboratory
2KClO3(s)  Catalyst 2KCl (s) + 3O2(g)
Which of the following statement(s) is (are) correct about the reaction ?

 
 
 
 

7. Which of the following reactions will not take place?

 
 
 
 

8. Which of the following involves combination of two elements ?

 
 
 
 

9. Which of the following is a NECESSARY condition for ALL chemical reactions?

 
 
 
 

10. A student notices that new hammer made of iron is shiny while an old one kept in the tool box has a reddish brown deposit over it. What does the change in colour of hammer indicate?

 
 
 
 

11. Which of the following is (are) an endothermic process(es)?

(i) Dilution of sulphuric acid
(ii) Sublimation of dry ice
(iii) Condensation of water vapours
(iv) Evaporation of water

 
 
 
 

12. 2AgI(s)  2Ag(s) + I2(g)
The colour of iodine is

 
 
 
 

13. Direction: In the following Question, the Assertion and Reason have been put forward. Read the statements carefully and choose the correct alternative from then following:

Assertion: Combustion reaction is also called exothermic oxidation reaction.
Reason: In a combustion reaction O2 is added and heat is released.
 
 
 
 

14. In the reaction Hg2Cl2 + Cl2 → 2HgCl2
The reducing agent is

 
 
 
 

15. Burning Magnesium ribbon is brought in the gas jar of carbon dioxide. Which of the following is correct ?
(i) It keeps on burning
(ii) It gets extinguished
(iii) Although CO2 is non-supporter of combustion but burning magnesium breaks CO2 into carbon and oxygen, oxygen helps in burning.
(iv) Carbon dioxide is supporter of combustion.

 
 
 
 

16.

The Step 1 and Step 2 respectively are

 
 
 
 

17.

Direction: In the following Question, the Assertion and Reason have been put forward. Read the statements carefully and choose the correct alternative from the following:
Assertion: Silver bromide decomposition is used in black and white photography.
Reason: Light provides energy for this exothermic reaction.
 
 
 
 

18. What is observed when a solution of potassium iodide is added to silver nitrate solution?

 
 
 
 

19. A student learns that food companies fill bags of chips with nitrogen gas. What is the purpose of packing it with N2 gas?

 
 
 
 

20. A student notices her jewellary turned dull and had grey black film over it after wearing for a few months. What results in the change in its colour?

 
 
 
 

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

 
 
 
 

22. Given below is the balanced chemical equation for the thermal decomposition of lead nitrate.

2Pb(NO3)2 → 2PbO + 4NO2 + O2
Which of the following information does the coefficients of PbO and NO2 in the equation (2 and 4 respectively) tell us?
 
 
 
 

23. Zinc reacts with silver nitrate to form which compounds?

 
 
 
 

24. Which of the following gases can be used for storage of fresh sample of an oil for a long time?

 
 
 
 

25. Which of the following is an example of simple displacement?

 
 
 
 

26. A student notices that bread kept out has a green coating over it after few days. What explains the reason for the student’s observation?

 
 
 
 

27.

Which of the following is correct observation of the reaction shown in above set up?

 
 
 
 

28. MnO2 + 4HCl → MnCl2 + H2O + Cl2
The oxidising agent is

 
 
 
 

29. Which of the following is precipitation as well as double displacement reaction?

 
 
 
 

30. The brown gas evolved on heating of copper nitrate is

 
 
 
 

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