Match the following compounds (Column-I) with their uses (Column-II) :
Correct Option: 4,
(I) $\mathrm{Ca}(\mathrm{OH})_{2}$ is used in white wash
(II) $\mathrm{NaCl}$ is used in preparation of washing soda
$2 \mathrm{NH}_{3}+\mathrm{H}_{2} \mathrm{O}+\mathrm{CO}_{2} \longrightarrow\left(\mathrm{NH}_{4}\right)_{2} \mathrm{CO}_{3}$
$\left(\mathrm{NH}_{4}\right)_{2} \mathrm{CO}_{3}+\mathrm{H}_{2} \mathrm{O}+\mathrm{CO}_{2} \longrightarrow 2 \mathrm{NH}_{4} \mathrm{HCO}_{3}$
$\mathrm{NH}_{4} \mathrm{HCO}_{3}+\mathrm{NaCl} \longrightarrow \mathrm{NH}_{4} \mathrm{Cl}+\mathrm{NaHCO}_{3}(\mathrm{~s})$
$2 \mathrm{NaHCO}_{3} \stackrel{\Delta}{\longrightarrow} \mathrm{Na}_{2} \mathrm{CO}_{3}+\mathrm{CO}_{2}+\mathrm{H}_{2} \mathrm{O}$
(III) $\mathrm{CaSO}_{4} \cdot \frac{1}{2} \mathrm{H}_{2} \mathrm{O}$ (Plaster of Paris) is used for making casts of statues
(IV) $\mathrm{CaCO}_{3}$ is used as an antacid