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

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Filtration

Crystallisation

Decantation

Distillation

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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