The degeneracy of $d-$orbitals is lost under:
$I$. Strong field ligand
$II$. Weak field ligand
$III$. Mixed field ligand
$IV$. Chelated ligand field
Choose the correct code:

Draw a figure to show the splitting of $d$ orbitals in an octahedral crystal field.

Among the following complexes,the one which shows zero crystal field stabilization energy $(CFSE)$ is

Which of the following complexes will have the lowest value of $\Delta_0$?

The octahedral complex of a metal ion $M^{3+}$ with four monodentate ligands $L_1, L_2, L_3$ and $L_4$ absorb wavelengths in the region of red,green,yellow and blue,respectively. The increasing order of ligand strength of the four ligands is:

Explain crystal field splitting in octahedral complexes.