Q.

The fraction of phenol dimerised in benzene if 20 g of phenol in 1 kg benzene exhibits a freezing point depression of 0.69 K. (Kf benzene = 5.12), (MW phenol = 94). What is the value of Van't Hoff for (i) in this reaction?

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a

0.63

b

0.37

c

0.46

d

0.64

answer is A.

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Detailed Solution

ΔTf=i.kb.m0.69=i×5.12×20×100094×1000⇒i=0.63
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