Among other gases, $C O_{2}$ content in the expired air is about

0.04 %

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0.03 %

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4.5 %

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2.1 %

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Solution

The correct option is C $4.5 %$
The exhaled air contains about 100 times more $C O_{2}$ concentration than inhaled air. Inhaled air usually contains about 0.04 % of $C O_{2}$ . Therefore, exhaled air contains about 4.5 % of $C O_{2}$ .

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