Ncert Exercises & Solutions

Q. 30 Give the electronic configuration of the following complexes on the basis

of crystal field splitting theory. ${[C o F_{6}]}^{3 -}, {[F e {(C N)}_{6}]}^{4 -} a n d [C u (N H]$ ₃)62+

According to spectrachemical series, ligands can be arranged in a series in the order of

increasing field strength i.e.,F- < NH, <CN

Hence. CN $^{-}$ and NH $_{3}$ , being strong field ligand pair up t $_{2 g}$ , electrons before filing e $_{g}$ set

${[C o F_{6}]}^{3 -}; C o^{3 +} = (d^{6}) t_{2}^{4} e_{g}^{2}$

$[C u (N H]$ ₃)62+, Cu2+(d9)t36eg3