Question

Identify X in the following reaction:
$HCl$ + X $\to$ $NaCl$ + $H_{2}C{O}_3$
$H_{2}C{O}_3$ $\to$ $H_{2}O$ + $C{O}_2$

• A. $NaHC{O}_3$
• B. $NaOH$
• C. $N{a}_{2}C{O}_3$
• D. None of these

Answer 1

The correct option is A $NaHC{O}_3$

It is an acid neutralisation reaction by a bicarbonate antacid.
Hydrochloric reacts with sodium bicarbonate to give salt and carbonic acid.

$HCl+NaHC{O}_3\to NaCl+H_{2}C{O}_3$

The carbonic acid futher breaks down into water and ${\text{CO}}_2$ gas.

$H_{2}C{O}_3\to H_{2}O+C{O}_2$$\uparrow$