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Explain the structures of : (A) Manganateion (B) Permangate ion. |
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Answer» SOLUTION :(A) (i) The manganate ion, `MnO_(4)^(2-)` is tetrahedral in structure. (ii) It is green and paramagnetic since it has one unpaired ELECTRON. (B) (i) The permanganate ion, Mno, is tetrahedral in structure. (ii) It is purple and diamagnctic since it has all electrons paired. (iii) MN in `MnO_(4)^(2-)`, undergoes sp' hybridisation and four oxygen atoms are PLACED at the four corners of a tetrahedron and Mn at the centre. (IV) p-orbitals of oxygen atoms overlap with d-orbitals of Mn and form `pi` bonds. `Mn^(7+)`has electronic configuration `3d^(0)`.Hence there is no d-d transition of electron possible in `MnO_(4)^(-)` . (vi)The purple colourarisedue to chargetransfer. 
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