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Q.

When 20g of Naphthoic acid (C₁₁H₈O₂) is dissolved in 50g of Benzene ( $k_{f} = 1 .72 kg {mol}^{- 1}$ ), a freezing point depression of 2 K is observed. The Vant-Hoff’s factor (i) is

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a

2

b

1

c

0.5

d

3

answer is A.

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Detailed Solution

$△ T_{f} = i \times k_{f} \times m = i \times 172 \times \frac{20}{50} \times \frac{1000}{172} = 2 \Rightarrow i = 0 .5$

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