Benzoic acid is an organic compound. Its crude sample can be purified by crystallisation from hot water. What characteristic differences in the properties of benzoic acid and the impurity make this process of purification suitable?

(N/A) Benzoic acid can be purified from hot water because of the following characteristics:
$(i)$ Benzoic acid is more soluble in hot water and less soluble in cold water.
$(ii)$ Impurities associated with benzoic acid are either insoluble in water or are more soluble in water to such an extent that when a hot saturated solution of benzoic acid is cooled,the impurities remain in the solution.