Question

Which of the following is used as a source of $\mathrm{O}{2}$ in space capsules, submarines, etc.?
(A) $\mathrm{Na}
{2} \mathrm{O}$
B $\mathrm{Li}{2} \mathrm{O}$
C $\mathrm{Na}
{2} \mathrm{O}{2}$
D $\mathrm{K}
{2} \mathrm{O}$

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Answer

Question: Which of the following is used as a source of $\mathrm{O}_2$ in space capsules, submarines, etc.?

(A) $\mathrm{Na}_2 \mathrm{O}$
(B) $\mathrm{Li}_2 \mathrm{O}$
(C) $\mathrm{Na}_2 \mathrm{O}_2$
(D) $\mathrm{K}_2 \mathrm{O}$

:

The correct option is C: $\mathrm{Na}_2 \mathrm{O}_2$

Explanation:

In various chemical applications, sodium peroxide ($\mathrm{Na}_2 \mathrm{O}_2$) is employed as an oxidizing agent. One notable reaction is its interaction with carbon dioxide to generate oxygen, a reaction critical for life-support systems in constrained environments such as space capsules and submarines. The chemical equation for this reaction is:

$$ 2 \mathrm{Na}_2 \mathrm{O}_2 + 2 \mathrm{CO}_2 \rightarrow 2 \mathrm{Na}_2 \mathrm{CO}_3 + \mathrm{O}_2 $$

Through this reaction, sodium peroxide effectively releases dioxygen gas ($\mathrm{O}_2$), making it particularly valuable in contexts where a reliable oxygen supply is essential, such as in scuba gear, submarines, and space capsules.


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