Question:
Which of the following is paramagnetic?
Which of the following is paramagnetic?
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Weak field ligands (like F⁻) give:
High-spin complexes ⟹ paramagnetism
Updated On: Mar 19, 2026
- \([\mathrm{Fe(CN)_6}]^{4-}\)
- \([\mathrm{Ni(CO)_4}]\)
- \([\mathrm{Ni(CN)_4}]^{2-}\)
- [CoF₆]³-
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The Correct Option is D
Solution and Explanation
Step 1: Determine metal oxidation states and electron configuration.
Step 2: • [Fe(CN)₆]⁴-: Fe²+, low-spin d⁶, diamagnetic • [Ni(CO)₄]: Ni⁰, diamagnetic • [Ni(CN)₄]²-: Ni²+, square planar, diamagnetic • [CoF₆]³-: Co³+, high-spin d⁶, paramagnetic
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