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Cobalt (II) is stable in aqueous solutio...

Cobalt (II) is stable in aqueous solution but in the presence of complexing reagents ( strong field ligands ) it is readily oxidised. Why ?

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As `3d^(6)` configuration has higher CFSE as compared to `3d^(7)` so it gets oxidised in presence of complexing reagent to easily have `d^(2)sp^(3)` hybridisation
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