Question

Ammonia gas produces dense white fumes of ammonium chloride when a glass rod is dipped in HCl.

• A. True
• B. False

Answer 1

The correct option is A True

Hydrochloric acid is the aqueous solution of hydrogen chloride gas. Ammonia gas reacts with hydrogen chloride gas to form dense white fumes of ammonium chloride. This is used as a test to detect the presence of ammonia gas as per the reaction:
$N{H}_3\left(g\right)+HCl\left(g\right)\to N{H}_{4}Cl\left(s\right)$

Ammonia being a weak base combines with HCl to form ammonium chloride which produces dense white fumes. A proper amount of moisture is required for this reaction to initiate.
Therefore the statement is true.