Question

Match the crystal field diagrams given below with the following complex ions.

$\mathbf{[}\mathbf{Fe}{{\mathbf{\left(}\mathbf{CN}\mathbf{\right)}}_{\mathbf{6}}\mathbf{]}}^{\mathbf{3}\mathbf{-}}\mathbf{,}\mathbf{}\mathbf{[}\mathbf{Mn}{\mathbf{\left(}{\mathbf{H}}_{\mathbf{2}}\mathbf{O}\mathbf{\right)}}_{\mathbf{6}}{\mathbf{]}}^{\mathbf{2}\mathbf{+}}$

Short answer

Hence all the five electrons remain unpaired in ${\mathrm{t}}_{2\mathrm{g}}$ and ${\mathrm{e}}_{\mathrm{g}}$ orbitals as weak field is assumed.

Step-by-step solution

The electronic configuration of Mn2+is  3d5

Hence all the five electrons remain unpaired in ${\mathrm{t}}_{2\mathrm{g}}$ and ${\mathrm{e}}_{\mathrm{g}}$ orbitals as weak field is assumed.

The electronic configuration of  Fe3+is 3d5

Here all the five electrons remain paired in ${\mathrm{t}}_{2\mathrm{g}}$ orbitals as cyanide is strong field ligand of the octahedral complex.