What is the composition of oxygen by volume in the atmosphere?

21%

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31%

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17%

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26%

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Solution

The correct option is A 21%
Air contains about 21% of oxygen by volume. Nitrogen makes up about 78% of the air and the rest 1% consists of other gases.

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What is the composition of oxygen by volume in the atmosphere?

The correct option is A 21%Air contains about 21% of oxygen by volume. Nitrogen makes up about 78% of the air and the rest 1% consists of other gases.

The correct option is A 21%
Air contains about 21% of oxygen by volume. Nitrogen makes up about 78% of the air and the rest 1% consists of other gases.