The van't Hoff factor for a very dilute aqueous solution of $K [A g {(C N)}_{2}]$ is:

4

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3

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2

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5

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Solution

The correct option is D $2$
$K [A g (C N)_{2}]$ dissociate into $K^{+}$ and $[A g (C N)_{2}]^{-}$

So $i = 1 + 1 = 2$ .

Hence, the correct option is $C$

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