Calcium cyanamide on treatment with steam under pressure gives $NH_3$ and

Write the names of isotopes of hydrogen. What is the mass ratio of these isotopes?

On heating,hydrazoic acid forms:

Describe the bulk preparation of dihydrogen by the electrolytic method. What is the role of an electrolyte in this process?

Hydrogen can be obtained from water,by the action of water on

Comment on the reactions of dihydrogen with $(i)$ chlorine,$(ii)$ sodium,and $(iii)$ copper $(II)$ oxide.