The number of ions given by one molecule of $K_{4} F e (C N)_{6}$ after complete dissociation is____________.

5

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11

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2

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10

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Solution

The correct option is A $5$
$K_{4} F e (C N)_{6} ⟶ 4 K^{+} + [F e (C N)_{6}]^{- 4}$
Total number of ions on complete dissociation= $5$
As ions in co-ordination sphere will not dissociate so $F e^{2 +}$ and $C N^{-}$ ions will not dissociate into their respective ions.

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