Question

Q2. State the type of chemical reaction in each of the following: [1x4]
i) When electric current is passed through water, hydrogen and oxygen gases are produced.
ii) When oxygen is passed over red, hot copper, copper oxide is produced.
iii) Calcium carbonate produces calcium oxide and carbon dioxide on heating.
iv) Calcium reacts with water to give calcium hydroxide and hydrogen gas.

Answer 1

Explanation:

1. Electrolytic decomposition reactions(also known as electrolysis)

2. combination reaction

3. Thermal decomposition reaction

4. combination reaction, but your question is wrong Calcium reacts with water to give calcium hydroxide and HEAT NOT HYDROGEN GAS.