What happens when:
(i) sodium metal is dropped in water?
(ii) sodium metal is heated in free supply of air?
(iii) sodium peroxide dissolves in water?

Write balanced equation for reactions between:
Na₂O₂ and water

Write balanced equation for reactions between:
KO₂ and water

Write balanced equation for reactions between:
Na₂O and CO₂.

Account for the following:
(i) Sodium imparts colour to the flame.
(ii) Sodium acts as a strong reducing agent.

Name a few important uses of sodium ?

Discuss in brief the Solvay process for the manufacture of washing soda. 

Discuss the various reactions which occur in the Solvay ammonia process.

List some important uses of washing soda (sodium carbonate).

Potassium carbonate cannot be prepared by Solvay process. Why?