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Q.

One molal solution of a carboxylic acid in benzene shows the elevation of boiling point of 1.518 K.  The degree of association for dimerization of the acid in benzene is ( Kb for benzene is 2.53 K kg mole-1 )

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a

0.6

b

0.7

c

0.75

d

0.8

answer is B.

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Detailed Solution

∆Tb=Kbm=2.53×1=2.53K , i=∆Tbobserved∆Tbnormal=1.5182.53=0.6 ;  i=1-α+αn; i=1-0.6+0.62;
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