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Question

Crystallisation is better than simple evaporation because:


  1. all of these

  2. may get charred when heated to dryness

  3. the contaminate can still be present

  4. soilds can decompose


Solution

The correct option is A

all of these


Crystallisation is better than simple evaporation because:
1. The process of evaporation gives a residue which may contain some impurities. When we require obtaining a solid without impurity, crystallisation method is preferred. 
2. In evaporation, heat has an adverse effect on the mixture that is to be separated. For example, solids can decompose and may get charred when heated to dryness.

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