Question:medium

The diamagnetic species is :

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When analyzing the magnetic property of coordination compounds, check the electron pairing in the metal's d-orbitals.
Updated On: Feb 24, 2026
  • [Ni(CN)$_4$]$^{2-}$
  • [NiCl$_4$]$^{2-}$
  • [Fe(CN)$_6$]$^{3-}$
  • [CoF$_6$]$^{3-}$
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The Correct Option is A

Solution and Explanation

The complex [Ni(CN)$_4$]$^{2-}$ is diamagnetic as all electrons in the Ni$^{2+}$ ion are paired within the low-spin octahedral structure. Conversely, other species possess unpaired electrons, resulting in paramagnetism.
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