Question

Select from the list the gas that matches the descriptions given in each case:

[ammonia, ethane, hydrogen chloride, hydrogen sulphide, ethyne]

This gas produces dense white fumes with ammonia gas.

Answer 1

$N{H}_3$ reacts with $HCl$ gas to give the dense white fumes of $N{H}_{4}Cl$.

$N{H}_3+HCl\to N{H}_{4}Cl$