Q.

In which case depression in freezing point is equal to cryoscopic constant for water:

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6% by mass of urea in aqueous solution

100 g of sucrose in 100 mL solution

9 g of glucose in 59 g aqueous solution

1 M KCl solution

answer is C.

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Detailed Solution

∵ ΔTf=Kf×molality59 solution has 9 g glucose and 50 g water ∴ ΔT=Kf×9180×100050=Kf

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