Sodium is heated in air at $300^{\circ} \mathrm{C}$ to form $X . X$ absorbs $\mathrm{CO}_2$ and forms…
Sodium is heated in air at $300^{\circ} \mathrm{C}$ to form $X . X$ absorbs $\mathrm{CO}_2$ and forms $\mathrm{Na}_2 \mathrm{CO}_3$ and $Y$. Which of the following is $Y$ ?
$\mathrm{H}_2$
$\mathrm{O}_2$
$\mathrm{H}_2 \mathrm{O}_2$
$\mathrm{O}_3$
Solution
The reaction is as follows
$\begin{gathered}
2 \mathrm{Na}+\mathrm{O}_2 \stackrel{300^{\circ} \mathrm{C}}{\longrightarrow} \underset{\text { sodium peroxide }(\mathrm{X})}{\mathrm{Na}_2 \mathrm{O}_2} \\
2 \mathrm{Na}_2 \mathrm{O}_2+2 \mathrm{CO}_2 \longrightarrow 2 \mathrm{Na}_2 \mathrm{CO}_3+\mathrm{O}_2 \uparrow
\end{gathered}$
(Y)
Sodium peroxide is used in the purification of air in submarines because it combines. with $\mathrm{CO}_2$ to give $\mathrm{O}_2$.