Solutions

Hint: Higher the value of i, higher will be the depression in freezing point

KCl$\leftrightarrow {\mathrm{K}}^{+}$ $+$ ${\mathrm{Cl}}^{–}$

For KCl, i value is 2.

For ${\mathrm{C}}_6{\mathrm{H}}_{12}{\mathrm{O}}_6$, value of i is 1.

${\mathrm{Al}}_2({\mathrm{SO}}_4{)}_3\leftrightarrow 2{\mathrm{Al}}^{3+}$ $+$ $3{\mathrm{SO}}_4^{2–}$

For ${\mathrm{Al}}_2({\mathrm{SO}}_4{)}_3$, i value is 5.

${\mathrm{K}}_2{\mathrm{SO}}_4\leftrightarrow 2{\mathrm{K}}^{+}$ $+$ ${\mathrm{SO}}_4^{2–}$

For K₂SO₄, i vale is 3

For ${\mathrm{Al}}_2({\mathrm{SO}}_4{)}_3$, i value is maximum hence, option third is the correct answer.