Question : The carbon dioxide content in the air that we exhale is about
Option 1: 4 %
Option 2: 8 %
Option 3: 12 %
Option 4: 16 %
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Correct Answer: 4 %
Solution : The correct option is - 4%
The amount of air that is inhaled has 21% oxygen and 0.04% carbon dioxide, whereas the amount of air that is expelled has 16% oxygen and 4% carbon dioxide. This is so because when we breathe, our cells use the oxygen in the air to produce energy and generate carbon dioxide as a byproduct.
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