Question

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

• A. Potassium ferrocyanide.
• B. Hexamine cobalt $\left(III\right)$ Chloride.
• C. Tetramine copper $\left(II\right)$ sulphate.
• D. Potassium dichlorodioxalato cobaltate $\left(III\right)$.

Answer 1

The correct option is C Tetramine copper $\left(II\right)$ sulphate.

EAN value of complexes,

1. Potassium ferrocyanide $=26-2+12=36$
2. Hexamine cobalt ( III ) Chloride $=27-3+12=36$
   
3. Tetramine copper ( II ) sulphate $=27-2+8=33$
   
4. Potassium dichlorodioxalato cobaltate ( III ) $=27-3+4+8=36$