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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(H2O)6]3+
For the complex [Fe(H2O))6]3+, the outer electronic configuration of Fe+2 is 3d5(t1,1,12ge1,1g)
The crystal field stabilization energy (CFSE) is:

[0.4×number of electrons in t2g+0.6×number of electrons in eg]Δo=[0.4×3+0.6×2]Δo=0.

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