Which of the following statements is not correct about the given reaction ?
$K_{4} [F e (C N)_{6} O x i d a t i o n - ----- \to F e^{3 +} + C O_{2} + N O_{3}^{-}$

Fe is oxidised from

F e^{2 +} t o F e^{3 +}

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Carbon is oxidised from

C^{2 +} t o C^{4 +}

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N is oxidised from

N^{3 -} t o N^{5 +}

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Carbon is not oxidised.

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Solution

The correct option is D Carbon is not oxidised.
In the reaction:
$K_{4} [F e (C N)_{6}] O x i d a t i o n - ----- \to F e^{3 +} + C O_{2} + N O_{3}^{-}$
The oxidation of the elements are:
$_{4} [+ 2 F e (+ 2 C - 3 N)_{6}] O x i d a t i o n - ----- \to + 3 F e^{3 +} + + 4 C_{2} + + 5 N {_{3}}^{-}$
Therefore Fe is oxidised from $F e^{2 +}$ to $F e^{3 +}$ .
Carbon is oxidised from $C^{2 +}$ to $C^{4 +}$ . Thus Carbon gets oxidised.
N is oxidised from $N^{3 -}$ to $N^{5 +}$ .

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