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Amongst the following ions, which one has the highest magnetic moment ? (i) [Cr(H_(2)O)_(6)]^(3+) (ii) [Fe(H_(2)O)_(6)]^(2+) (iii) [Zn(H_(2)O)_(6)]^(2+) |
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Answer» Solution :The oxidation states are : Cr (III), Fe (II) and Zn (II). E.C. of `Cr^(3+)=3d^(3)`, unpaired ELECTRONS = 3 (inner ORBITAL complex) E.C. of `Fe^(2+)=3d^(6)`, unpaired electrons = 4 (outer orbital/high spin complex) E.C. of `Zn^(2+)=3d^(10)`, unpaired electrons = 0 (outer orbital complex) `mu=sqrt(n(n+2))`. Hence (ii) has highest magnetic moment. |
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