Which one of the following electrolytes has the same value of van't Hoff factor (i) as that of Al(SO4)(if all are 100% ionised)?

Options

A. `AI(NO_3)_3`
B. `K_4 [Fe(CN)_6]`
C. `K_2 SO_4`
D. `K_3[Fe(CN)_6]`

Answer

B

Explanation

`Al_2(SO_4)_3 to 2AI^(3+) + 3SO_4^(2-),i=5`
`AI(NO_3)_3 to AI3^(3+) + 3NO_3^-, i = 4`
`K_4[Fe(CN)_6] to 4K^+ + [Fe(CN)_6]^(4-), i = 5`
`K_2SO_4 to 2K^+ + SO_4^(2-), i = 3`
`K_3[Fe(CN)_6] to 3K^+ + [Fe(CN)_6]^(3-), i = 4`