Give reasons :

Ammonium nitrate is not used in the preparation of ammonia.

Give reasons :

Conc.${\mathrm{H}}_2{\mathrm{SO}}_4$ is a good drying agent, yet it is not used to dry ${\mathrm{NH}}_3$.

Give reasons :

In the lab preparation of ammonia calcium hydroxide is used in excess

Give reasons :

In the lab preparation of ammonia flask is fitted in slanting position.

State the following condition required in the Haber's process.

Temperature

State the following condition required in the Haber's process.

Pressure

State the following conditions required in the Haber's process.

Catalyst

Correct the following :

A reddish brown precipitate is obtained when ammonium hydroxide is added to ferrous sulphate.