Q.

The 0.0001 molal solution of a complex AB10 has the freezing point of -0.0015°C in water. Assuming 100% dissociation of the complex, find the proper representation of the complex. [Kf(H2O = 1.86 Km-l)l

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a

AB8

b

AB3B7

c

AB7B3

d

AB5B5

answer is B.

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Detailed Solution

At 100% dissociation, van't Hoff vactor, if ' i=n (no. of ions from the complex). Now ΔTf=iKfm⇒i=n=ΔTfKfm=0.00151.86×0.0001=8Thus there should be 8 ions in solution⇒ The compound should be AB3B7
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