Chemistry - Liquid Solution Question with Solution | TestHub

The depression in freezing point is given by $\Delta T_f=i\cdot K_f\cdot m$.

For urea, being a non-electrolyte, the van 't Hoff factor $i=1$.

Thus, $\Delta T_f\propto m$.

To exhibit the minimum freezing point depression, the solution must have the minimum molality.

Among the given options, $0.06$ m is the minimum concentration.

Therefore, the $0.06$ m urea solution exhibits the minimum freezing point depression.

Answer: $0.06$ m