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When 20 g of naphthoic acid (C(11)H(8)O(...

When 20 g of naphthoic acid `(C_(11)H_(8)O_(2))` is dissolved in 50 g of benzene (`K_(f)=1.72 "K kg mol"^(-1)`) a freezing point depression of 2K is observed. The Van't Hoff factor `(i)` is :

A

0.5

B

1

C

2

D

3

Text Solution

Verified by Experts

The correct Answer is:
A
`DeltaT_(f)=iK_(f)m`
`m=((20)/(172)xx1000)/(50)=2.326`
`:.2=ixx1.72xx2.326`
or `i=(2)/(1.72xx2.316)=0.50`
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