Chemistry - Liquid Solution Question with Solution | TestHub

Depression in freezing point is a colligative property, so depends upon the number of particles. Among, potassium chloride (KCl), sodium sulphate $\left({\mathrm{Na}}_2{\mathrm{SO}}_4\right),$ magnesium sulphate $\left({\mathrm{MgSO}}_4\right)$ and magnesium carbonate $\left({\mathrm{MgCO}}_3\right),{\mathrm{Na}}_2{\mathrm{SO}}_4$ produces maximum number of particles. ${\mathrm{Na}}_2{\mathrm{SO}}_4\rightleftharpoons \underset{3\text{ particles }}{\underbrace{2{\mathrm{Na}}^{+}+{\mathrm{SO}}_4^{2-}}}$ Thus, it causes maximum depression in freezing point.