Chemistry - Coordination Chemistry Question with Solution | TestHub

Complexes in which central atom has unpaired electrons is said to be paramagnetic in nature and where unpaired electrons are not present are diamagnetic in nature.

${\left[\mathrm{Fe}{\left(\mathrm{CN}\right)}_6\right]}^{3-}$,   ${\mathrm{Fe}}^{+3}$  $\left(3{\mathrm{d}}^5\right) \to {{\mathrm{t}}_{2\mathrm{g}}^{}}^{2,2} {{\mathrm{e}}_{\mathrm{g}}}^1$, paramagnetic (one unpaired electron)

${\left[\mathrm{Fe}{\left(\mathrm{CN}\right)}_6\right]}^{4-}, {\mathrm{Fe}}^{+2} \left(3{\mathrm{d}}^6\right)\to {{\mathrm{t}}_{2\mathrm{g}}}^6{{\mathrm{e}}_{\mathrm{g}}}^0$ ,diamagnetic 

${\left[\mathrm{Ti}{\left(\mathrm{CN}\right)}_6\right]}^{3-}, {\mathrm{Ti}}^{+3}\left(3{\mathrm{d}}^1\right)\to {{\mathrm{t}}_{2\mathrm{g}}}^1$ , Paramagnetic ($1$ unpaired electron)

${\left[\mathrm{Ni}{\left(\mathrm{CN}\right)}_4\right]}^{2-}, {\mathrm{Ni}}^{+2}\left(3d^8\right)\to$ Diamagnetic

${\left[\mathrm{Co}{\left(\mathrm{CN}\right)}_6\right]}^{3-}, {\mathrm{Co}}^{+3}\left(3{\mathrm{d}}^6\right)\to {{\mathrm{t}}_{2\mathrm{g}}}^6, \mathrm{diamagnetic}$