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Which one of the following electrolytes has the same value of van't Hoff's factor (i) as that of $Al_2(SO_4)_3$ (if all are 100% ionized)?
A
$K_2SO_4$
B
$K_3[Fe(CN)_6]$
C
$Al(NO_3)_3$
D
$K_4[Fe(CN)_6]$
Detailed Solution
$Al_2(SO_4)_3 \rightarrow 2Al^{3+} + 3SO_4^{2-}$, i = 5
$K_4[Fe(CN)_6] \rightarrow 4K^+ + [Fe(CN)_6]^{4-}$, i = 5
($K_2SO_4$: i = 3; $K_3[Fe(CN)_6]$: i = 4; $Al(NO_3)_3$: i = 4)
$K_4[Fe(CN)_6] \rightarrow 4K^+ + [Fe(CN)_6]^{4-}$, i = 5
($K_2SO_4$: i = 3; $K_3[Fe(CN)_6]$: i = 4; $Al(NO_3)_3$: i = 4)