Which of the following is used as a source of $O_{2}$ in space capsules, submarines etc.?

$N a_{2} O$

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$L i_{2} O$

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$N a_{2} O_{2}$

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$K_{2} O$

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Solution

The correct option is C
$N a_{2} O_{2}$

In chemistry preparations, sodium peroxide is used as an oxidizing agent. It is also used as an oxygen source by reacting it with carbon dioxide to produce oxygen and sodium carbonate:

$2 N a_{2} O_{2} + 2 C O_{2} \to 2 N a_{2} C O_{3} + O_{2}$

It is thus particularly useful in scuba gear, submarines, and space capsules as a source of dioxygen gas.

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