The increasing order of field strength of ligands is:

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:

The correct statements among $I$ to $III$ are:
$I$. Valence bond theory cannot explain the color exhibited by transition metal complexes.
$II$. Valence bond theory can predict quantitatively the magnetic properties of transition metal complexes.
$III$. Valence bond theory cannot distinguish ligands as weak and strong field ones.

$CN^{-}$ ligand containing complexes are generally ...... .

Among the following species,the one which causes the highest $CFSE, \Delta _0$ as a ligand is

Select the correct order of $\Delta_o$ (Crystal Field Splitting Energy).