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Question

Crystallisation is better than simple evaporation because:


A

soilds can decompose

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B

may get charred when heated to dryness

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C

the contaminant can still be present

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D

all of these

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Solution

The correct option is D

all of these


Crystallisation is better than simple evaporation because:
1. The process of evaporation gives a residue which may contain some impurities. Whereas, through crystallisation method, we obtain a solid without any impurity.
2. Evaporation is a slow process, so usually, heat is supplied to speed it up. But often, heat has an adverse effect on the mixture that is to be separated. This happens because a few soilds can decompose and may get charred when heated to dryness.


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