Question

The magnitude of crystal field stabilization energy in octahedral field depends on

I : the nature of the ligand

II : the charge on the metal ion

III : the size of metal cation

• A. $I,II,III\text{all are correct}$
• B. $I,II\text{are correct}$
• C. $I,III\text{are correct}$
• D. $III\text{only correct}$

Answer 1

The correct option is A $I,II,III\text{all are correct}$

The magnitude of crystal field stabilisation energy in octahedral field depends on the nature of ligands, the charge on the metal ions and the size of metal ions.

For same metal ion, same ligand and fixed coordination number, the $CFSE\propto \text{oxidation state of metal}$
Metal with higher oxidation state will have higher $CFSE$ value.

Strong ligands cause high value of $CFSE$ and weak ligands cause low value of $CFSE$.

For the same ligand and oxidation state, the CFSE value is proportional to the size of metal ion.
Thus, the order of CFSE is
$3d<4d<5d$

Hence, option (a) is correct.