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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 50 g of benzene `(K_(f)=1.72"K kg mol"^(-1))`, a freezinf 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)=ixxK_(f)xx(W_("solute")xx1000)/(m_("solute")xxW_("solvent"))`
`2=ixx1.7xx(20xx1000)/(172xx50)`
`i=0.5`
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