Coordination Compounds - Result Question 50
####56. Low spin complex of $d^{6}$-cation in an octahedral field will have the following energy : [2012 M]
(a) $\frac{-12}{5} \Delta_o+P$
(b) $\frac{-12}{5} \Delta_o+3 P$
(c) $\frac{-2}{5} \Delta_o+2 P$
(d) $\frac{-2}{5} \Delta_o+P$
$(\Delta_o=.$ Crystal Field Splitting Energy in an octahedral field, $P=$ Electron pairing energy)
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Solution:
(b) for $d^{6}, t _{2 g}{ }^{6} e_g{ }^{0}$ (in low spin)
C.F.S.E $=-0.4 \times 6 \Delta_0+3 P$
$=-\frac{12}{5} \Delta_o+3 P$
[ $P$ is pairing energy for one electron]
