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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 to be pure substances. Air is not supposed to be considered as a pure substance as air is a mixture of different gases. It mainly contains nitrogen and oxygen in about 78% and 20% respectively and some other gases along with moisture. The composition of air is not constant and changes from place to place.
The correct statement would be that air is a mixture.
 
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