In which of the following complex ions will the metal ion have t62ge0g configuration according to CFT?
A
[FeF6]2−
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B
[Fe(CN)6]3−
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C
[Fe(CN)6]4−
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D
None of these
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Solution
The correct option is C[Fe(CN)6]4− For t62ge0g, Fe should contain 6 electrons in its valence shell. So we can eliminate option (b) since here Fe is in +2 oxidation state. Again, in the given configuration all the electrons are paired so the ligand must be strong field. Hence in [Fe(CN)6]4− the metal is in t62ge0g configuration.