The correct statement about the magnetic properties of \([\mathrm{Fe(CN)_6}]^{3-}\) and \([\mathrm{FeF_6}]^{3-}\) is : (Z = 26).
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- Both are paramagnetic.
- Both are diamagnetic.
- \([\mathrm{Fe(CN)_6}]^{3-}\) is paramagnetic, \([\mathrm{FeF_6}]^{3-}\) is diamagnetic.
- \([\mathrm{Fe(CN)_6}]^{3-}\) is diamagnetic, \([\mathrm{FeF_6}]^{3-}\) is paramagnetic.
The Correct Option is A
Solution and Explanation
\(\mathrm{CN^-}\) is a strong-field ligand: electrons pair up as \(t_{2g}^5e_g^0\), 1 unpaired electron, paramagnetic (d2sp3).
\(\mathrm{F^-}\) is a weak-field ligand: \(t_{2g}^3e_g^2\), 5 unpaired electrons, paramagnetic (sp3d2).
Both are paramagnetic.
Answer: (1) Both are paramagnetic.
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