Question

# Among the following complexes the one which shows Zero crystal field stabilizations energy (CFSE)?

A
[Nn(H2O)6]3+
B
[Fe(H2O)6]3+
C
[Co(H2O)6]2+
D
[Co(H2O)6]3+

Solution

## The correct option is A $$[Fe(H_2O)_6]^{3+}$$For the complex $$[Fe(H_2O))6]^{3+}$$, the outer electronic configuration of $$Fe^{+2}$$ is $$3d^5 (t_{2g}^{1,1,1} e_g^{1,1})$$The  crystal field stabilization energy (CFSE) is: $$[-0.4\times \text {number of electrons in }t_{2g} + 0.6\times \text {number of electrons in } e_g] \Delta_o = [-0.4\times 3 + 0.6\times 2] \Delta_o = 0$$.Chemistry

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