MHT CET Chemistry Question (2026) — Solution

Step-by-step solution

The depression in freezing point is given by T_f = i K_f m. For complete dissociation, the van't Hoff factor i is equal to the number of ions produced per formula unit. For 0.2 m Potassium chloride (KCl): i = 2, i m = 2 0.2 = 0.4 For 0.1 m Sodium chloride (NaCl): i = 2, i m = 2 0.1 = 0.2 For 0.05 m Aluminium phosphate (AlPO_4): i = 2, i m = 2 0.05 = 0.1 For 0.15 m Magnesium sulphate (MgSO_4): i = 2, i m = 2 0.15 = 0.3 Since 0.05 m Aluminium phosphate has the minimum value of i m, it exhibits the minimum freezing point depression. Answer: 0.05 m Aluminium phosphate