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Question

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

A
potassium ferrocyanide
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B
potassium ferricyanide
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C
tetracarbonyl nickel
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D
hexaammine cobalt (III) chloride
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Solution

The correct option is C potassium ferricyanide
It is calculated as: EAN=ZX+Y,

Here, metal is Fe So, Z=26,X=3,and Y=12

EAN=263+12=35

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

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