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Gases MCQs

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Gases

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CSS - PMS - CCE - PCS - General Science Gases
Which gas do humans exhale in greater amount than they inhale?
A. Oxygen
B. Carbon dioxide
C. Nitrogen only
D. Helium
Correct Answer: B
B: Correct because cellular respiration produces carbon dioxide, so exhaled air has more CO2. A: Wrong because oxygen is consumed by the body. C: Wrong because nitrogen is mostly unchanged. D: Wrong because helium is not produced by the body.
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