When 30 g of this acid C11H8O2 is dissolved in 60 g of benzene, a freezing point depression of 2K is observed. [Kf(benzene)=1.72 K mol−1 kg]. The van't Hoff factor (i) is

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0.4

answer is B.

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Detailed Solution

ΔTf=1000Kfw1(solute)m1(solute)w2(i)w1=30.0 gm1=11×12+8×1+2×16=172 g mol−1w2=60.0 g∴ ΔTf=2=1000×1.72×30×i172×60i=0.4

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