Which of these statements is/are true about the given sample of air?
Nitrogen - 78.0%
Oxygen - 16.4%
Carbon dioxide - 4.4%

Dissolved air from pond water

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Fresh air from a field

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Exhaled air

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Polluted air near a factory

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Solution

The correct option is A Exhaled air
The percentage of oxygen and carbon dioxide in inhaled air is 21% and 0.04% respectively. During respiration, oxygen is used up by the cells producing carbon dioxide. The percentage of carbon dioxide in exhaled air is 4.4% and oxygen is 14-16% and nitrogen is 78%.
So, the correct answer is option C.

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