Multiple choice

The magnetic moment of an octahedral Co(II) complex is 4.0 BM. The electronic configuration of the central metal ions is

  1. 5t2g, 2eg

  2. 6t2g , 1eg

  3. 3t2g, 4eg

  4. 4t2g, -3eg

  5. None of these

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A Correct answer
Explanation

This option is correct, because the Co(II) octahedral complex has 4.0 BM magnetic moment when the Co(II) act as the high spin in nature. Therefore 3 unpaired electrons contribute in t2g and one unpaired electron in eg set. Therefore the magnetic moment  is 4.0 BM.