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 neutralization reaction by a bicarbonate antacid.
$HCl$ + $NaHC{O}_3$ $\to$ $NaCl$ + $H_{2}C{O}_3$

Even $N{a}_{2}C{O}_3$ reacts with HCl forming the same product, but $N{a}_{2}C{O}_3$ requires 2HCl molecules.

$2HCl$ + $N{a}_{2}C{O}_3$ $\to$ $2NaCl$ + $H_{2}C{O}_3$

So, the correct option is $NaHC{O}_3$