Question

v) The percentage of oxygen in air is approximately -
a) 80%
b) 20%
c) 10%
d) 1%​

Answer 1

21%

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Answer 2

Explanation:

Air is a mixture of gases. It contains 79% nitrogen, 21 % oxygen, 0.93% argon, 0.03% carbon dioxide, and traces of hydrogen, helium and other "noble" gases.