The depression in freezing point of $0.1 \mathrm{M}$ aqueous solutions of $\mathrm{HCl}, \mathrm{CuSO}_4$…
The depression in freezing point of $0.1 \mathrm{M}$ aqueous solutions of $\mathrm{HCl}, \mathrm{CuSO}_4$ and $\mathrm{K}_2 \mathrm{SO}_4$ are in the ratio
$1: 1: 1.5$
$1: 2: 3$
$1: 1: 1$
$2: 4: 3$
Solution
$\Delta T_f=i K_f m$
Thus, $\Delta T_f \propto i$ (as concentration is same for all solutions) $i$ for $\mathrm{HCl}=2, i$ for $\mathrm{CuSO}_4=2, i$ for $\mathrm{K}_2 \mathrm{SO}_4=3$ Thus, ratio of depression in freezing point $=2: 2: 3=1: 1: 1.5$