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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

`75% `

C

`25% `

D

`99%`

Text Solution

Verified by Experts

The correct Answer is:
B
`2C_6H_5OH hArr (C_6H_5OH)_2`
`{:(2,0),(2-2alpha,alpha):}`
`7=14xx0.8((2-alpha)/2)" "[DeltaT_f=k_f.m.i]`
`alpha = 0.75 =75%`
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