Question

Combination of one volume of nitrogen with three volumes of hydrogen produces

(a) one volume of ammonia. 

(b) two volumes of ammonia.

(c) three volumes of ammonia.

(d) one and a half volumes of ammonia.

Answer 1

(b) two volumes of ammonia.

The law of combining volume (for gases) states that. when gases react with each other, they follow Gay-Lussac's law.

The volume of reactants and products in a large number of chemical reactions are related to each other by small integers, provided the volumes are measured at the same temperature and pressure. 

As per balance equation,