Percentage of $O_{2}$ present in inhaled air in man is about

21%

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78%

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43%

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Solution

The correct option is A 21%
Inhaled air contains more oxygen used to create energy and less CO $_{2}$ . It contains 21% O $_{2}$ , 0.04% CO $_{2}$ and 79% Nitrogen. Thus, option A is correct.

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