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MHT CET202521 Apr 2025Morning ShiftChemistrySolutionsActual

Which of the following aqueous solutions exhibits lowest freezing point depression assuming complete dissociation?

Options

  1. A0.1 ~m~ NaCl ₄
  2. B0.05 ~m~ MgSO ₄
  3. C0.08 ~m~ AlPO ₄
  4. D0.06 ~m~ Al ₂ ( SO ₄ )₃

Correct answer

B. 0.05 ~m~ MgSO ₄

Step-by-step solution

Freezing point depression is given by T_f = i K_f m , where i is the van’t Hoff factor and m is the molality. Since K_f is constant, the depression is proportional to i m . For 0.05 m MgSO ₄ , dissociation gives i = 2 and i m = 2 0.05 = 0.1 . Compared to values of 0.2 , 0.16 , and 0.3 for options A, C, and D respectively, 0.1 is the lowest. Final answer: B

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