Chemical Reactions and Equations" for Class 10:

 Here are 10 MCQs from the chapter "Chemical Reactions and Equations" for Class 10:

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1. Which of the following is a physical change?

a) Rusting of iron

b) Boiling of water

c) Burning of magnesium ribbon

d) Souring of milk

2. Which of the following is a balanced chemical equation?

a) H₂ + O₂ → H₂O

b) 2H₂ + O₂ → 2H₂O

c) H₂ + O₂ → 2H₂O

d) H₂ + 2O₂ → H₂O

3. Which of the following represents a decomposition reaction?

a) 2H₂ + O₂ → 2H₂O

b) CaCO₃ → CaO + CO₂

c) Zn + H₂SO₄ → ZnSO₄ + H₂

d) AgNO₃ + NaCl → AgCl + NaNO₃

4. What is the color of ferrous sulphate crystals?

a) White

b) Green

c) Blue

d) Pink

5. The reaction in which energy is absorbed is called:

a) Exothermic reaction

b) Endothermic reaction

c) Displacement reaction

d) Combination reaction

6. Which of the following is a redox reaction?

a) CaCO₃ → CaO + CO₂

b) Zn + CuSO₄ → ZnSO₄ + Cu

c) NaOH + HCl → NaCl + H₂O

d) BaCl₂ + Na₂SO₄ → BaSO₄ + 2NaCl

7. What is formed when lead nitrate is heated?

a) Lead chloride and oxygen

b) Lead oxide, nitrogen dioxide, and oxygen

c) Lead sulphate and carbon dioxide

d) Lead and water

8. Which of the following reactions is a displacement reaction?

a) 2H₂ + O₂ → 2H₂O

b) Zn + H₂SO₄ → ZnSO₄ + H₂

c) CaCO₃ → CaO + CO₂

d) HCl + NaOH → NaCl + H₂O

9. The precipitate formed in the reaction between BaCl₂ and Na₂SO₄ is:

a) NaCl

b) BaSO₄

c) H₂O

d) HCl

10. What change is observed when copper powder is heated in a china dish?

a) Becomes black

b) Becomes green

c) Becomes red

d) Becomes white

Here are the answers to the 10 MCQs from the chapter "Chemical Reactions and Equations":

1. b) Boiling of water

2. b) 2H₂ + O₂ → 2H₂O

3. b) CaCO₃ → CaO + CO₂

4. b) Green

5. b) Endothermic reaction

6. b) Zn + CuSO₄ → ZnSO₄ + Cu

7. b) Lead oxide, nitrogen dioxide, and oxygen

8. b) Zn + H₂SO₄ → ZnSO₄ + H₂

9. b) BaSO₄

10. a) Becomes black