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Van't Hoff factor of centimolal solu...

Van't Hoff factor of centimolal solution of `K_(3) [Fe(CN)_(6)]` is 3.333 . Calculate the percent dissociation of `K_(3) [Fe (CN)_(6)]`

A

33.33

B

`0.78`

C

78

D

23.33

Text Solution

Verified by Experts

The correct Answer is:
C
`K_(3)[Fe(CN)_(6)] ltimplies 3K^(+) + [Fe (CN)_(6)]]^(3-)`
`x =3, y=1`
`n^(') = 3+1 =4, I = 3.333`
`therefore % a = (i-1)/(n'-1) xx 100`
`=(3.333 -1)/(4-1) xx 100 = (2.333-1)/3 xx 100`
`=77.76%`
`~=78%`
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