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Q.

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

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a

9 g of glucose in 59 g aqueous solution

b

6% by mass of urea in aqueous solution

c

1 M KCl solution

d

100 g of sucrose in 100 mL solution

answer is C.

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Detailed Solution

$∵ {ΔT}_{f} = K_{f} \times molality$

59 solution has 9 g glucose and 50 g water

$∴ ΔT = K_{f} \times \frac{9}{180} \times \frac{1000}{50} = K_{f}$

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