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Question

1 mol CH3COOH is added in 250 g benzene. Acetic acid dimerises in benzene due to hydrogen bond. Kb of benzene is 2 K kgmol1. The boiling point has increased by 6.4 K. % dimerisation of acetic acid is :

A
50
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B
40
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C
30
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D
20
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Solution

The correct option is C 40
ΔTb=iKb.m

Given molality =1×1000250=4m

ΔTb=iKbm

6.4=i×2×4

i=0.8

For dimerisation,

i=1β20.81=β2

β=0.4

β%=40%

Option B is correct.

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