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Among the following complexes the one which shows zero crystal field stabilization energy (CFSE):
A
$[Mn(H_2O)_6]^{3+}$
B
$[Fe(H_2O)_6]^{3+}$
C
$[Co(H_2O)_6]^{2+}$
D
$[Co(H_2O)_6]^{3+}$
Detailed Solution
$Fe^{3+}$ is $d^5$ and $H_2O$ is a weak field ligand, so the complex is high spin: $t_{2g}^3e_g^2$.
CFSE $= 3(-0.4\Delta_o) + 2(0.6\Delta_o) = 0$
CFSE $= 3(-0.4\Delta_o) + 2(0.6\Delta_o) = 0$