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

When `20g` of naphtholic acid `(C_(11)H_(8)O_(2))` is dissolved in `50g` of benzene `(K_(f) = 1.72 K kg mol^(-1))` a freezing point depression of `2K` is observed. The van'f 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)=ixxK_(f)xx"molality" rArr 2=ixx1.72xx(20)/(172)xx(1000)/(50)`
rArr 2=4i`
rArr i=1//2=0.5`
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