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Question:

A solution containing 62g ethyl glycol in 250g water is cooled to 0°C. If Kf for water is 1.86 K kg mol⁻¹, the amount of water separated as ice is:

32

48

16

64

Solution:

ΔTf = Kf.m
10 = 1.86 × 62/62W kg⁻¹
W = 0.186 kg
ΔW = (250 - 86) = 64g
Hence, the correct option is D