The complex that violates the EAN (Effective Atomic Number) rule is:

potassium ferrocyanide

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potassium ferricyanide

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tetracarbonyl nickel

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hexaammine cobalt (III) chloride

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Solution

The correct option is C potassium ferricyanide
It is calculated as: $E A N = Z - X + Y$ ,

Here, metal is $F e$ So, $Z = 26, X = 3, a n d Y = 12$

$E A N = 26 - 3 + 12 = 35$

Here, EAN is 35, and hence, it is not attaining the nearest noble gas configuration.

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