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 `2 K` is observed. The Van't Hoff factor (i) is

Options

A. 0.5
B. 1
C. 2
D. 3

Answer

A

Explanation

`Delta_(l)=ixxk_(l)xxm`
`2=ixx1.72xx(20xx1000)/(172xx50)`
`i=0.5`