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Q.

Which of the following techniques is used to purify impure solids?

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a

 Filtration

b

Decantation

c

Distillation

d

 Crystallisation

answer is B.

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Detailed Solution

  • Crystallisation is a technique that is commonly used to purify impure solids.
  •  It involves dissolving the impure solid in a suitable solvent and then allowing the solvent to evaporate slowly under controlled conditions of temperature and concentration. 
  • As the solvent evaporates, the concentration of the solute in the solution increases, and eventually, the solute starts to crystallize out. 
  • The resulting crystals are usually purer than the original solid because impurities tend to remain in the solution rather than crystallizing out with the solute.
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