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

State one appropriate observation for : Excess of chlorine gas is reacted with ammonia gas.

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.

Give a balanced equation for : Reduction of hot Copper (II) oxide to copper using ammonia gas.