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Q.

The percentage of nitrogen in air is?

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a

21 %

b

0.1 %

c

54 %

d

78 % 

answer is D.

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Detailed Solution

        Air is a mixture of different gasses.
        The Earth's atmosphere is made up of about 78 percent nitrogen and 21 percent oxygen.
        Other gasses like hydrogen, neon and carbon dioxide are also present in very small amounts in the air.
 
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