Question

Ammonia gas when bought in contact with $HCl$ forms solid:
(a) Ammonia
(b) Ammonium Chloride
(c) Hydrogen Sulphide
(d) None of above

Answer 1

Ammonia is a colourless gas having a pungent smell and is a compound of hydrogen and nitrogen, having molecular formula $N{H_3}$ . In these questions, we have to know the reaction of the ammonia gas with $HCl$ .

Complete answer
We have to know the reaction of the ammonia gas with the $HCl$ ,
The reaction of ammonia gas with $HCl$ is as follows:
$N{H_3}(g) + HCl \to N{H_4}Cl\left( s \right)$
The reaction of ammonia in a gaseous state with $HCl$ gives ammonium chloride.

Hence, the correct option is (b) Ammonium Chloride.

Additional Information:
Some chemical and physical properties of ammonia:
(a) Ammonia is a colourless gas at room temperature, having suffocating odour with irritating gas with a pungent smell.
(b) Ammonia is anhydrous at its pure state, and hygroscopic in nature.
(Hygroscopic: The molecule having the property to absorb the moisture from the atmosphere is called Hygroscopic.)
(c) Ammonia gas is highly compressible and changes in liquid under pressure.
(d) Ammonia is not as flammable but when exposed to heat, they may explode.
(e) Ammonia is having alkaline properties and is corrosive in nature.
Uses of Ammonia:
(a) Ammonia is used as fertilisers.
(b) It is used as a refrigerant gas.
(c) It is also useful in manufactures of textiles, dyes etc. and also for the purification of the water bodies.
(d) For household cleaning purposes, by adding $5 - 10\%$ of the ammonia with the water it can be used for cleaning purposes.

Note
The ammonia acts as a base, having alkaline properties and corrosive nature. We can identify the ammonia gas by its suffocating and pungent odour. The inhalation of the ammonia can cause irritation in the nose, throats and respiratory systems.