The freezing point of 0.1M solution of glucose is -1.86° C. If an equal volume of 0.3 M glucose solution is added, the depression in freezing point of the mixture will be (make your answer to nearest integer) (take 1m=1M )

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answer is 4.

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Detailed Solution

$K_{f} = {ΔT}_{f} / m = 1.86 / 0.1 = 18.6 0.1 \times V + 0.3 V = M_{3} \times 2 V Or M_{3} = 0.2, {ΔT}_{f} = 18.6 \times 0.2 = 3 . 72^{\circ} T_{f} = - 3 . 72^{\circ} C$

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