The correct order of spin only magnetic moments for the following complex ions is
- [Fe(CN)6]3-< [CoF6]3- < [MnBr4]2- < [Mn(CN)6]3-
- [Fe(CN)6]3-< [Mn(CN)6]3- < CoF6]3- < [MnBr4]2-
- [COF6]3- < [MnBr4]2- < [Fe(CN)6]3- < [Mn(CN)6]3-
- [MnBr4]2- < [CoF6]3- < [Fe(CN)6]3- < [Mn(CN)6]3-
The Correct Option is B
Solution and Explanation
\([CoF_6]^{3-:}\) \(Co^{3+} (d^6)\) with weak field ligand \(F^-\). Weak field ligands do not cause electron pairing, so:
\(\uparrow \uparrow \uparrow \uparrow \uparrow \uparrow \quad (\text{u.e.} = 4)\)
\([MnBr_4]^{2-:}\) \(Mn^{2+} (d^5)\) with weak field ligand \(Br^-\). No pairing occurs
:\(\uparrow \uparrow \uparrow \uparrow \uparrow \quad (\text{u.e.} = 5)\)
\([Fe(CN)_6]^{3-:}\) \(Fe^{3+} (d^5)\) with strong field ligand \(CN^-\). Strong field ligands cause electron pairing:
\(\uparrow \downarrow \uparrow \downarrow \uparrow \quad (\text{u.e.} = 1)\)
\([Mn(CN)_6]^{3-:}\) \(Mn^{3+} (d^4)\) with strong field ligand \(CN^-\). Pairing occurs: \(\uparrow \downarrow \uparrow \downarrow \quad (\text{u.e.} = 2)\)
Order of magnetic moments: The spin-only magnetic moment is proportional to the number of unpaired electrons (u.e.): \([Fe(CN)_6]^{3-} < [Mn(CN)_6]^{3-} < [CoF_6]^{3-} < [MnBr_4]^{2-}\)
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