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Question

20.95% of the air is
(a) carbon dioxide
(b) oxygen
(c) nitrogen
(d) sulphur

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Solution

(b) Oxygen
Air contains 20.95% of oxygen.

Air is made up of 78.09% nitrogen, 20.95% oxygen, 0.93% argon, 0.04% carbon dioxide, and other gases in meager amounts.



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