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Question

What is CFSE of complex ion [FeF6]4 in terms of Δo?

A
-0.4
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B
0.4
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C
-0.6
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D
0.6
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Solution

The correct option is A -0.4
Fe is in +2 state in [FeF6]4

Fe[Ar]4s23d6

Fe2+[Ar]3d6

Since F is a weak ligand according to CFSE theory there will be 4 electrons in three t2g orbital and 2 electrons in two eg level.

CFSE= [(-0.4)4 + (0.6)2]Δo= -0.4Δo

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