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Q.

A solution containing 62g ethylene glycol in 250g water is cooled to -10°C. If Kf for water is 1.86Kkgmol−1, 

the amount of water (in g) separated as ice is

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a

48

b

16

c

32 

d

64

answer is D.

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Detailed Solution

ΔTf=Kf⋅m10=1.86×62/62Wkg⇒W=0.186kgΔW=(250−186)=64gm.

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