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1. The reaction Fe + CuSO₄ → FeSO₄ + Cu is:

2. Which metal can displace copper from CuSO₄ solution?

3. The reaction Na₂SO₄ + BaCl₂ → BaSO₄ + 2NaCl is:

4. A reaction that produces an insoluble solid is called:

5. Which is the white precipitate formed in reaction of BaCl₂ with Na₂SO₄?

6. The reaction 2Cu + O₂ → 2CuO shows:

7. The reverse reaction CuO + H₂ → Cu + H₂O shows:

8. In redox reactions:

9. In the reaction ZnO + C → Zn + CO, which substance is reduced?

10. In the reaction MnO₂ + HCl → MnCl₂ + H₂O + Cl₂, which substance is oxidised?

11. Which process damages iron articles by forming rust?

12. The green coating on copper articles is due to:

13. Which gas is used in chip packets to prevent rancidity?

14. Rancidity is caused by:

15. Which reaction is opposite to combination reaction?