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Why sodium peroxide is used in submarine...

Why sodium peroxide is used in submarines?

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Submarine is a closed vessel and carbon-dioxide is accumulated in it.
Sodium peroxide is basic. It absorbs carbon-dioxide from atmosphere and releases pure oxygen.
`2Na_(2)O_(2)to2Na_(2)CO_(3)+O_(2)`
In submarines use of `Na_(2)O_(2)` cleans air and avoid suffocation.
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