Sodium metal reacts vigorously with water.

(a) Name the gas evolved when sodium reacts with water.

(b) State whether the solution formed by the reaction of sodium with water is acidic or basic.

Which gas is evolved when sodium metal reacts with water?

(a) Name a metal for each case:
(i) it does not react with cold as well as hot water but reacts with steam.
(ii) It does not react with any physical state of water.

(b) When calcium metal is added to water, the gas evolved does not catch fire but the same gas evolved on adding sodium metal to water catches fire. Why is it so?