Which of the following solutions exhibits highest freezing point depression?

Step-by-step solution

The freezing point depression is governed by T_f = i K_f m , where i is the van't Hoff factor. The solution with the largest i m exhibits the greatest depression. For NaCl : i = 2 , so i m = 2 0.1 = 0.2 . For MgSO ₄ : i = 2 , so i m = 2 0.05 = 0.1 . For AlPO ₄ : i = 2 , so i m = 2 1 = 2.0 . For Al ₂( SO ₄)₃ : i = 5 , so i m = 5 0.05 = 0.25 . The maximum i m = 2.0 occurs for 1 m AlPO ₄ .