Each of the following obey sidewick effective atomic number rule except:

[C r {(C O)}_{6}]

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

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{[N i {(N H_{3})}_{6}]}_{6}^{2 +}

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{[P t C l_{6}]}_{6}^{2 -}

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Solution

The correct option is A ${[N i {(N H_{3})}_{6}]}_{6}^{2 +}$
EAN for $[C r {(C O)}_{6}] - 24 + 12 = 36$ (Following Sidewick rule)

EAN for ${[C o {(N H_{3})}_{6}]}_{6}^{3 +} - 24 + 12 = 36$ (Following Sidewick rule)

EAN for ${[N i {(N H_{3})}_{6}]}_{6}^{2 +} - 26 + 12 = 38$ (Not Following Sidewick rule)

EAN for ${[P t C l_{6}]}_{6}^{2 -} - 74 + 12 = 76$ (Following Sidewick rule)

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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 -}

K_{4} F e (C N)_{6}

C r (C O)_{6}

F e (Z = 26)

C r (Z = 24)

[C o (N H_{3})_{6}]^{3 +} is :

E A N

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

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