Give the general group characteristics applied to hydrogen with respect to similarity in properties of hydrogen with –

(a) alkali metals of group 1 [IA]
(b) halogens of group 17 [VIIA].

with special reference to valency electrons & ion formation.

How did the name 'hydrogen' originate. How does hydrogen occur in the combined state.

Give balanced equations for obtaining hydrogen from ?

(a) Boiling water using a divalent metal

(b) Steam using a trivalent metal

(c) Steam using a metal – and the reaction is reversible.

State why hydrogen is not prepared in the laboratory by the action of –

(a) Sodium with cold water.

(b) Calcium with dilute sulphuric acid.

(c) Lead with dilute hydrochloric acid.