Give reason —

Conc. H₂SO₄ is a good drying agent, yet it is not used to dry NH₃.

Give reason —

In the lab. preparation of ammonia

1. calcium hydroxide is used in excess.
2. Flask is fitted in slanting position.

Choose the correct word or phrase from the brackets to complete the following sentences and write balanced equations for the same.

(a) Ammonium chloride is a soluble salt prepared by …………… [precipitation, neutralization].

(b) When ammonium chloride is heated, it undergoes …………… [thermal decomposition/dissociation].

(c) Heating ammonium chloride with sodium hydroxide produces …………… [ammonia, nitrogen].

An element has 2 electrons in it's N shell. It reacts with a non-metal of atomic number 7. The compound formed reacts with warm water and produces a basic gas. Identify the elements and write the balanced chemical reactions.