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Question

How much percentage of oxygen is present in the air which we breath out?

A
21%
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B
10%
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C
16%
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D
30%
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Solution

The correct option is C 16%
During respiration we breathe in oxygen and breathe out carbon dioxide. The air which we breathe in consists of 21% oxygen by volume. The air which we breathe out consists of 16% oxygen by volume.

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