Q.

Benzoic acid mixed with naphthalene can be purified by 

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a

Dissolving the mixture in benzene

b

Treating the mixture with cold water

c

Sublimation

d

Treating the mixture with hot water

answer is D.

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Detailed Solution

Napthalene is a sublimable substance mixture of benzoic acid and Napthalene can be separated by sublimation process.  

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Benzoic acid mixed with naphthalene can be purified by