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.

Rewrite the correct statement with the missing word/s — Magnesium nitride reacts with water to liberate ammonia.

Name the gas produced when excess ammonia reacts with chlorine.