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Question

Which of the following inner orbital octahedral complex ions are diamagnetic?


A

[Co(NH3)6]+3

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B

[Mn(CN)6]+3

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C

[Fe(CN)6]4

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D

[Fe(CN)6]3

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Solution

The correct options are
A

[Co(NH3)6]+3


C

[Fe(CN)6]4


All the ligands are strong and would thus force electron pairing given a chance! But from the given, both Co3+ and Fe+2 both have the d6 configuration, which means there just won't be any unpaired electrons. Three of the d-orbitals are completely filled - paired because of strong field ligands. To accommodate six ligands, with two unfilled d-orbitals, the hybridization then becomes d2sp3. Hence, these two are diamagnetic!

Let us look at the electronic configuration for the Co3+ complex:

For the ferrocyanide anion, the lower t2g gets completely filled (low-spin configuration) because of the strong field ligand and high Δoct:


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