The freezing point of a 4 % aqueous solution of X is equal to the freezing point of a 12 % aqueous solution of Y . If the molecular weight of X is A , then the molecular weight of Y will be

Question

The freezing point of a 4 % aqueous solution of X is equal to the freezing point of a 12 % aqueous solution of Y . If the molecular weight of X is A , then the molecular weight of Y will be, 2 A, A, 4 A, 3 A

MARKS App · Accepted Answer

Freezing point depression refers to the lowering of the freezing point of solvent upon the addition of solute. ΔT f X = ΔT f Y k f m x = k f m y 4 × 1000 A × 96 = 12 × 1000 M × 88 M = 3 .27 A ≃ 3 A

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