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Question

For which of the following types of ions is the number of unpaired electrons in octahedral complexes fixed at the same number as in the free ion no matter, how weak or strong the crystal field is?

A
d3
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B
d4
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C
d5
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D
d6
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Solution

The correct option is A d3
For d3 configuration, the number of unpaired electrons is 3. It is irrespective of the strength of the ligand field.
This is because, three electrons enter t2g level and are unpaired. When fourth electron is present its position (in t2g or g level) will be determined by the strength of the ligand field.

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