Which of the following species does not follow EAN rule?

[F e (C N)_{6}]^{3 -}

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[C o (N H_{3})_{6}] C l_{3}

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M n_{2} (C O)_{10}

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C r (C O)_{6}

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Solution

The correct option is B $[F e (C N)_{6}]^{3 -}$
Let us consider $[F e (C N)_{6}]^{3 -}$
Fe has $+ 3$ oxidation state
The number of electron in $F e (I I I)$ of the complex
$= 26 - 3 = 23$
number of electrons donated by the $6 C N^{-}$ is $12$
$E A N$ of $F e (I I I)$ in $[F e (C N)_{6}]^{3 -} = 23 + 12 = 35$
Since this number is different from the electrons present in the next Nobel gas ( $K r = 36$ ), $E A N$ rule is not satisfied.

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[C u (N H_{3})_{4}]^{2 +}, [C u (e n)_{3}]^{2 +}, [C u (C N)_{4}]^{3 -}

[F e (C N)_{6}]^{4 -}, [F e (C N)_{6}]^{3 -}, F e (C O)_{6}

[N i (N H_{3})_{6}]^{2 +}, [N i (C N)_{4}]^{2 -}, [N i (C O)_{4}]

[C r (N H_{3})_{6}]^{3 +}, [C r (C O)_{6}]

[C o (N H_{3})_{6}]^{3 +}, [C o C l_{4}]^{2 -}

E A N

K_{3} [F e (C N)_{6}

[C o (N H_{3})_{6}] C l_{3}

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