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Which row in ...

Question

Which row in the table shows the correct percentage of oxygen in atmospheric and exhalend air ?
Atmospheric air / % Exhaled air /%
A 78 21
B 21 16
C 16 4
D 4 0.04

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Solution

Inhaled air is by volume 78.08% nitrogen, 20.95% oxygen and small amounts include argon, carbon dioxide, neon, helium, and hydrogen. so, 'the correct option is atmospheric /% - 78 and exhaled air/ % - 21'

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