Question:

Identify the complex ion/s with the least spin only magnetic moment (in BM).
I) [Fe(CN)$_6$]$^{3-}$
II) [Co(CN)$_6$]$^{3-}$
III) [Mn(CN)$_6$]$^{4-}$
IV) [Fe(CN)$_6$]$^{4-}$

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CN$^-$ is a strong field ligand; it promotes low spin configuration with fewer unpaired electrons.
Updated On: Jun 3, 2025
  • II \& IV only
  • I only
  • III only
  • I \& III only
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The Correct Option is A

Solution and Explanation

Strong field CN$^-$ ligand causes pairing of electrons in low-spin complexes. Among the given, Co$^{3+}$ in II and Fe$^{2+}$ in IV form low-spin, diamagnetic or nearly diamagnetic complexes.
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