Question:

Which of the following ion/ions is/are diamagnetic?

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Diamagnetic complexes have no unpaired electrons. Use crystal field theory to determine the spin state based on the ligand field strength.

Updated On: Jan 10, 2025
  • [CoF6]3−
  • [Co(NH3)6]3+
  • [Fe(OH2)6]2+
  • [Fe(CN)6]4−
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The Correct Option is B, D

Solution and Explanation

  • [CoF6]3−: Paramagnetic due to unpaired electrons in the high-spin configuration.
  • [Co(NH3)6]3+: Diamagnetic because NH3 is a strong field ligand, leading to a low-spin configuration with no unpaired electrons.
  • [Fe(OH2)6]2+: Paramagnetic due to unpaired electrons.
  • [Fe(CN)6]4−: Diamagnetic because CN− is a strong field ligand, leading to a low-spin configuration with no unpaired electrons.
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