Question

Name the type of chemical reaction.
1. When hydrogen burns in oxygen water is formed.
2. On passage of electricity, water breaks down to give hydrogen & oxygen.
3. CuO + H₂ → Cu + H₂O
4. KNO₃ + H₂SO₄ → HNO₃ + KHSO₄

Answer 1

Answer:

the above reaction is combination reaction

Answer 2

1. Combination reaction

2. Decomposition reaction

3. Redox reaction

4. Displacement reaction

Explanation:

1) When hydrogen burns in oxygen and water is formed. It is a combination reaction.  

2) When water is electrolysed into hydrogen and oxygen, it is called a decomposition reaction.

3) CuO + H₂ → Cu + H₂O. In this reaction, copper gets reduced while hydrogen gets oxidized simultaneously. So this is a redox reaction.

4) KNO₃ + H₂SO₄ → HNO₃ + KHSO₄ Potassium displaces hydrogen. So this is a displacement reaction.