The complex that violates the Sidwick's rule of $E A N$ is :

Potassium ferrocyanide.

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Hexamine cobalt

(I I I)

Chloride.

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Tetramine copper

(I I)

sulphate.

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Potassium dichlorodioxalato cobaltate

(I I I)

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Solution

The correct option is C Tetramine copper $(I I)$ sulphate.
EAN value of complexes,
Potassium ferrocyanide $= 26 - 2 + 12 = 36$
Hexamine cobalt ( III ) Chloride $= 27 - 3 + 12 = 36$
Tetramine copper ( II ) sulphate $= 27 - 2 + 8 = 33$
Potassium dichlorodioxalato cobaltate ( III ) $= 27 - 3 + 4 + 8 = 36$

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Using IUPAC norms write the formulae of the following:
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(iv) Potassium tetracyanonickelate (II)

(v) Pentaamminenitro-O-cobalt (III)

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