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Q.

Addition of 0.223g of phenyl acetic acid (C6H5CH2COOH) to 4.4g of benzene decreases the freezing point of benzene by 0.830C. It shows (kf = 5.12 k kg mol–1)

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a

phenyl acetic acid exists as such in benzene

b

phenyl acetic acid undergoes partial ionization in benzene

c

phenyl acetic acid undergoes complete ionization in benzene

d

phenyl acetic acid dimerises in benzene

answer is D.

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Detailed Solution

GMW of  C6H5CH2COOH= 136gWt. of C6H5CH2COOH =0.223gWt. of solvent(Benzene) = 4.4gKf = 5.12oKgmole-1i = 0.435  i<1Phenyl acetic acid associates in Benzene
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