JEE Main levelOne or more correct optionsDifficulty 2 of 3si087
Which statements about purification of a solid by crystallisation are correct?
AThe impure solid is dissolved in the minimum amount of hot solvent.
BSlow cooling of the hot saturated solution generally gives larger and purer crystals.
CUsing a large excess of solvent increases the recovery of the crystals.
DInsoluble impurities are removed by filtering the hot solution.
Answer: A, B, D
Minimum hot solvent, slow cooling and hot filtration of insoluble impurities are standard steps. A large excess of solvent keeps more of the compound dissolved when cold and lowers the recovery, so statement 3 is wrong.