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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=ixxK_(f)xx(w_(B)xx1000)/(m_(B)xxw_(A))`
`2=ixx1.72xx(20xx1000)/(172xx50)`
`i=50`]
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