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75.2 g of C(6)H(5)OH (phenol) is dissolv...

`75.2 g` of `C_(6)H_(5)OH` (phenol) is dissolved in a solvent of `K_(f) = 14`. If the depression in freezing point is `7K`, then find the percentage of phenol that dimerises.

A

50

B

80

C

30

D

40

Text Solution

Verified by Experts

The correct Answer is:
B
`underset(1-alpha)(2C_(6)H_(5)OH)hArr underset(alpha//2)((C_(6)H_(5)OH)_(2))`
`i=1-alpha+(alpha)/(2)=(Delta T_(f))/(K_(f).m)rArr alpha = 0.8 = 80%`
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