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Q.

Which of the following is not a pure substance?


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a

Water

b

Carbon Dioxide

c

Air

d

Paper 

answer is C.

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Detailed Solution

Air is not a pure substance.
Pure substances are defined as those that are composed of only one type of atom or molecule. The chemical nature of all constituent particles of a substance is the same. Consider the terms element and compound. Air should not be considered a pure substance. Because air is a mixture of various gases. The majority of nitrogen and oxygen in the air is 78% and 20%, respectively.
 
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