Question

Soda ash is prepared by passing ______ over a concentrated solution of sodium hydroxide.

• A. $H_2$
• B. $O_2$
• C. $H_{2}S$
• D. $C{O}_2$

Answer 1

The correct option is D $C{O}_2$

Soda ash/sodium carbonate is $\left(N{a}_{2}C{O}_3\right)$.

When carbon dioxide $C{O}_2$ is passed over concentrated solution of sodium hydroxide $NaOH$, soda ash (sodium carbonate) is formed along with water.

The reaction takes place as follows :-

$2NaOH+C{O}_2\to N{a}_{2}C{O}_3+H_{2}O$

Thus, the correct answer is option (D).