State whether the following statements are True or False:
$(i)$ The purification of a solid is done by crystallisation.
$(ii)$ Crystallisation purifies the solid and distillation purifies the liquid.
$(iii)$ $A$ liquid is purified by sublimation.
$(iv)$ To separate a mixture of ammonium chloride and sodium chloride,the distillation method is applied.

(N/A) $(i) - \text{True}, (ii) - \text{False}, (iii) - \text{False}, (iv) - \text{False}$.
$(i)$ Crystallisation is a standard method for the purification of solid organic compounds.
$(ii)$ Crystallisation is used for solids,while distillation is used for liquids. The statement is false because it incorrectly claims distillation purifies solids.
$(iii)$ Sublimation is used to purify solids that sublime on heating,not liquids.
$(iv)$ Ammonium chloride $(NH_4Cl)$ is a sublimable solid,while sodium chloride $(NaCl)$ is not. Therefore,sublimation is used to separate this mixture,not distillation.