The percentage of oxygen in air is:

78%

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0.03%

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21%

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80%

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Solution

The correct option is D 21%
Air is a mixture of gases. It contains 78-79% nitrogen, 21 % oxygen, 0.93% argon, 0.03% carbon dioxide, and traces of hydrogen, helium, and other "noble" gases. So, the correct answer is option C.

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