The solution which produces the least number of ions on the dissociation of solute particles will show lowest depression in the freezing point. Hence, such a solution will have the highest freezing point.' Since, KCl and K2SO4 are ionic compounds, they will dissociate into ions in aqueous solution and will cause larger depression in freezing points as compared to non-electrolytes urea and glucose. Urea and glucose will remain as molecules in solution. Since, concentration of urea is lower than glucose, it will show lowest depression in the freezing point, therefore, highest freezing point.
