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Using valence bond theory explain geomet...

Using valence bond theory explain geometry, hybridisation and magnetic property of `[CoF_6]_3^-` (Atomic number of Co = 27).

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`[CoF_6]_3^-` In this complex, Co is present as ` Co^3+`. Outer configuration of `Co^3+ = 3d^6 4s^0` `F^-` is a weak field ligand, so no pairing occurs and thus, `F^-` occupy nd orbitals as because of the presence of four unpaired electrons, the complex is paramagnetic.
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