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Benzoic acid is an organic compound. Its...

Benzoic acid is an organic compound. Its crude sample can be purified by crystallisation from hot water. What characteristics difference in the properties of benzoic acid and the impurity make this process of purification suitable ?

A

Benzoic acid is not soluble in hot water but soluble in cold water.

B

Impurities present in benzoic acid are either insoluble in water or are more soluble in water to such an extent that when a hot saturated solution of benzoic acid is cooled, the impurities remain in the solution. Since impure benzoic acid satisfies both these conditions, it can be purified by crystallization.

C

Both A and B

D

None

Text Solution

Verified by Experts

The correct Answer is:
B
Benzoic acid can be purified from hot water because of the following characteristics :
(i) Benzoic acid is more soluble in hot water but less soluble in cold water.
(ii) Impurities present in benzoic acid are either insoluble in water or are more solable in water to such an extent that when a hot saturated solution of benzoic acid is cooled, the impurities remain in the solution. Since impure benzoic acid satisfies both these conditions, it can be purified by crystallization.
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