Give balanced equation for the reaction : Ammonia and Oxygen in the presence of a catalyst.

Nitrogen gas can be obtained by heating :

(a) Ammonium nitrate

(b) Ammonium nitrite

(c) Magnesium nitride

(d) Ammonium chloride

State two observations for : NH₄OH soln. is added to zinc nitrate soln. slowly and then in excess.

The following questions are based on the preparation of ammonia gas in the laboratory:

(i) Explain why ammonium nitrate is not used in the preparation of ammonia.

(ii) Name the compound normally used as a drying agent during the process.

(iii) How is ammonia gas collected? Explain why it is not collected over water.