MCQ Class 10 Science Chapter 1 Chemical Reactions and Equation

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MCQ’s For All Chapters – Science Class 10th

1. Which of the following is a sign of a chemical reaction?

Question 1 of 20

2. What is formed when magnesium ribbon burns in air?

Question 2 of 20

3. Which side of a chemical equation shows the products?

Question 3 of 20

4. The equation Mg + O₂ → MgO is an example of:

Question 4 of 20

5. Which law is followed while balancing a chemical equation?

Question 5 of 20

6. The reaction Zn + H₂SO₄ → ZnSO₄ + H₂ is:

Question 6 of 20

7. In the equation Fe + H₂O → Fe₃O₄ + H₂, which element is first balanced?

Question 7 of 20

8. What notation is used for aqueous solution in chemical equations?

Question 8 of 20

9. What is the product of CaO + H₂O?

Question 9 of 20

10. The reaction CaO + H₂O → Ca(OH)₂ is an example of:

Question 10 of 20

11. The reaction in which heat is released along with products is called:

Question 11 of 20

12. Respiration is an example of:

Question 12 of 20

13. The reaction Ca(OH)₂ + CO₂ → CaCO₃ + H₂O is used in:

Question 13 of 20

14. The reaction CaCO₃ → CaO + CO₂ is an example of:

Question 14 of 20

15. The reaction 2AgCl → 2Ag + Cl₂ in sunlight is:

Question 15 of 20

16. The reaction 2Pb(NO₃)₂ → 2PbO + 4NO₂ + O₂ is:

Question 16 of 20

17. In electrolysis of water, why is the volume of hydrogen double that of oxygen?

Question 17 of 20

18. Which reaction produces brown fumes of nitrogen dioxide?

Question 18 of 20

19. Which reaction produces ferric oxide, SO₂ and SO₃?

Question 19 of 20

20. Decomposition reactions require energy in the form of:

Question 20 of 20


 

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