Write balanced equation for : Action of warm water on magnesium nitride.

Distinguish between the following pairs of compounds using the test given in bracket :

(i) Iron [II] sulphate and iron [III] sulphate [using ammonium hydroxide]

(ii) A lead salt and a zinc salt [using excess ammonium hydroxide]

State the conditions required for : Catalytic oxidation of ammonia to nitric oxide.

Name the other ion formed when ammonia dissolves in water. Give one test that can be used to detect the presence of the ion produced.