Nitric acid is prepared by the reaction of sodium nitrate with acetic acid.

During the laboratory preparation of $\mathrm{H}\mathrm{C}\mathrm{l}$ gas, conc.${\mathrm{H}}_2{\mathrm{S}\mathrm{O}}_4$ is used as _____ agent.

Formula of aqua fortis is _____.

(A) ${\mathrm{HNO}}_3$               (B) $\mathrm{HCl}$                 (C) ${\mathrm{H}}_2{\mathrm{SO}}_4$

Enter your correct answer as A, B or C.

Formula of sal ammoniac is _____.

$\mathrm{A}. \mathrm{NaOH}$

$\mathrm{B}. {\mathrm{NH}}_4\mathrm{Cl}$

$\mathrm{C}. {\mathrm{NH}}_4{\mathrm{NO}}_3$

(Enter your correct answer as $\mathrm{A}, \mathrm{B} \mathrm{or} \mathrm{C}$)

Sometimes, a sticky mass of _____ is formed during the laboratory preparation of $\mathrm{HCl}$ gas.

Complete the following chemical reaction:

$2 \mathrm{\_\_\_\_\_} + {\mathrm{H}}_2{\mathrm{SO}}_4 \to {\mathrm{K}}_2{\mathrm{SO}}_4 + 2{\mathrm{H}}_2\mathrm{O}$

Complete the following reaction:

_____$+ {\mathrm{H}}_2{\mathrm{SO}}_4 \to {\mathrm{Na}}_2{\mathrm{SO}}_{4 }+ {\mathrm{H}}_2\mathrm{O} + {\mathrm{CO}}_2$

Choose from the following:

A: ${\mathrm{Na}}_2{\mathrm{CO}}_3$

B: ${\mathrm{NaCO}}_3$