Question

A transition metal (M) among Mn, Cr, Co, and Fe has the highest standard electrode potential $ M^{n}/M^{n+1} $. It forms a metal complex of the type $[M \text{CN}]^{n+}$. The number of electrons present in the $ e $-orbital of the complex is ... ...

Hint:

In coordination chemistry, the number of electrons in the \( e \)-orbital of a complex depends on its d-orbital splitting. This splitting occurs when ligands interact with the central metal ion, influencing the number of available electrons in the \( e \)-orbital.

Answer 1

Correct Answer: 6

Co has the highest standard electrode potential among Mn, Cr, Co, and Fe. The complex is \([ \text{Co(CN)}_6 ]^{3-}\), and its splitting is as follows: 

 
The number of electrons in the \( e \)-orbital of the complex is 6.