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Question

Amount of CO2 in expired air is about

A
0.04%
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B
0.03%
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C
4.5%
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D
21%
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Solution

The correct option is C 4.5%
Amount of CO2 in expired air is 4 - 5%. Hence, answer should be C.
Compositon of exhaled air is 78.04% nitrogen, 13.6% - 16% oxygen, 4% - 5.3% carbon dioxide, 1% argon and other gases.

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