$K O_{2}$ is used in space and submarines because it:

absorb

C O_{2}

and increase

O_{2}

concentration

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absorb moisture

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absorb

C O_{2}

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produce ozone

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Solution

The correct option is A absorb $C O_{2}$ and increase $O_{2}$ concentration
Because it absorbs CO2 and increases O2 concentration according to the following reaction:

$4 K O_{2} + 2 C O_{2} \to 2 K_{2} C O_{3} + 3 O_{2}$

As in product again $O_{2}$ is produced so its best to generate oxygen using carbon dioxide produced during breathing by using cylinder's gas.

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