Question:medium

Which one of the following complex ions is diamagnetic in nature?

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To determine if a complex is para- or diamagnetic, follow these steps: 1. Find the oxidation state of the central metal. 2. Determine the number of d-electrons in the metal ion. 3. Classify the ligand as strong-field (causes pairing, low-spin) or weak-field (no pairing, high-spin). 4. Fill the d-orbitals (\(t_{2g}\) and \(e_g\)) accordingly. 5. If there are any unpaired electrons, it's paramagnetic. If all electrons are paired, it's diamagnetic. Co\(^{3+}\) and \(d^6\) ions with strong-field ligands are a common source of diamagnetic complexes.

Updated On: Mar 30, 2026

[CoF\(_6\)]\(^{3-}\)
[Co(ox)\(_3\)]\(^{3-}\)
[Mn(CN)\(_6\)]\(^{3-}\)
[Fe(CN)\(_6\)]\(^{3-}\)

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The Correct Option is B

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