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75.2gC(6)H(5)OH is dissolved in 1 kg of ...

`75.2gC_(6)H_(5)OH` is dissolved in 1 kg of solvent of `K_(f)=14Kkg"mol"^(-1)`. If the depression in freezing point is 7K, then find the percentage of dimerisation of phenol

A

7.5

B

55

C

75

D

85

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