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Which one of the following 0 . 06 M aqueous solutions has lowest freezing point ?

Options

  1. AAl 2 SO 4 3
  2. BC 6 H 12 O 6
  3. CKI
  4. DK 2 SO 4

Correct answer

A. Al 2 SO 4 3

Step-by-step solution

T f ∘ - T f = iK f · m T f = Freezing point of the solution. i = Van 't Hoff factor K f = molal freezing point depression constant m = molality For minimum T f , i should have the maximum value. Al 2 SO 4 3 i = 5 C 6 H 12 O 6 i = 1 KI i = 2 K 2 SO 4 i = 3

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