Q.

Which of the following is NOT soluble in water?

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a

Salt

b

Sugar

c

Oxygen

d

Sand 

answer is D.

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Detailed Solution

        Sand is not soluble in water due to large particles as well as the inability to dissolve.
        It is settled down in the water because sand is heavier than water and can be separated by the process of sedimentation, decantation and filtration.
        Salt, sugar and oxygen all are soluble substances i.e. can dissolve in water.
 
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