Q5 / 160 · TS EAMCET 2005 · Chemistry

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 $Y$ ?

  • A
    $\mathrm{H}_2$
  • Correct answer
    B
    $\mathrm{O}_2$
  • C
    $\mathrm{H}_2 \mathrm{O}_2$
  • D
    $\mathrm{O}_3$

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 $\mathrm{O}_2$.

Hence, the correct answer is option: 'B'.

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