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Q.

Is it true that air is a pure substance?


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a

True

b

False 

answer is B.

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Detailed Solution

The above statement is false.
Generally, elements and compounds have a constant composition throughout and can be said as pure substances. Air is not supposed to be considered a pure substance as air is a mixture of different gases. It mainly contains nitrogen and oxygen in about 78% and 20% respectively. And the composition of air is not constant and changes from place to place.
The corrected statement would be, “Air is a mixture”.
 
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