Of the following 0.10 m aqueous solutions, which one will exhibit the largest freezing point depression?

Colligative properties are directly proportional to the number of solute particles.

On dissociation of ${\mathrm{Al}}_2{\left({\mathrm{SO}}_4\right)}_3\to 2{\mathrm{Al}}^{+3} + 3{\mathrm{SO}}_4^{2-}$

$\mathrm{i}=\frac{5}{1}=5$

$∆{\mathrm{T}}_{\mathrm{f}}=\mathrm{i}{\mathrm{K}}_{\mathrm{f}}\mathrm{m}$

$\mathrm{i}$ is highest for $\mathrm{A}{\mathrm{l}}_2{\left(\mathrm{S}{\mathrm{O}}_4\right)}_3$