Question

Identify the substance underlined, in the following case:
A solid formed by reaction of two gases, one of which is acidic and the other basic in nature.

Answer 1

Ammonium chloride ($N{H}_{4}Cl$) is the solid formed by reaction of two gases, one of which is acidic and the other basic in nature.
$N{H}_3\left(g\right)+HCl\left(g\right)\to N{H}_{4}Cl\left(s\right)$
Hydrogen chloride $\left(HCl\right)$ gas is acidic in nature where as ammonia $N{H}_3$ gas is basic in nature.