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Question

The complex that violates the Sidwick's rule of EAN is :

A
Potassium ferrocyanide.
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B
Hexamine cobalt (III) Chloride.
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C
Tetramine copper (II) sulphate.
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D
Potassium dichlorodioxalato cobaltate (III).
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Solution

The correct option is C Tetramine copper (II) sulphate.
EAN value of complexes,
  1. Potassium ferrocyanide =262+12=36
  2. Hexamine cobalt ( III ) Chloride =273+12=36
  3. Tetramine copper ( II ) sulphate =272+8=33
  4. Potassium dichlorodioxalato cobaltate ( III ) =273+4+8=36

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