Crystallisation is a process that separates a pure solid in the form of its crystals from a solution. A solid can also be separated from its solution by evaporation. However crystallisation technique is better than simple evaporation technique. We can get an impure sample of a solid even after evaporation. Some solids decomposes or some may get charred on heating to dryness during evaporation.
Crystallisation is a better process than evaporation because

Options

A. it takes lesser time
B. some impurities may remain in the filtrate which remain with the solid after evaporation
C. some solid is lost during evaporation
D. chemical properties change during evaporation

Answer

B

Explanation

Some impurities may get dissolved in the solvent and remain with the solid after evaporation.