For a very dilute aqueous solution of $K_{4} [F e {(C N)}_{6}]$ , van't Hoff factor is :

i = 11

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i = 5

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i = \frac{1}{11}

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i = 10

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Solution

The correct option is B $i = 5$
Considering complete dissociation,
$K_{4} [F e (C N)_{6}] \to 4 K^{+} + [F e (C N)_{6}]^{4 -}$

$i = 5$

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