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.

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

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]