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Question

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


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