Q.

Which of the following is not a mixture?


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a

Air

b

Seawater

c

Pure water

d

Soil 

answer is C.

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Detailed Solution

Pure water is not a mixture.
When we mix two or more elements or compounds and no chemical change is observed between them, we obtain a mixture of those elements or compounds. There are no new molecules created in a combination. Some examples of mixtures are air, seawater, soil, tap water, etc. The mixtures are separated with the help of different separation techniques.
 
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