The colour of KMnO4 is due to:

The colour of KMnO4 is due to charge transfer transitions by absorption of visible light.

Why is KMnO4 coloured?

KMnO4 has a deep purple colour. The metal ions in KMnO4 contains d electron and, therefore, charge transfer occurs from O to Mn+. In fact, the lowest energy L→M charge transfer is due to the transition of a nonbonding 2p oxygen electron to the unoccupied molecular orbital level of doing tetrahedral compound. As the positive charge on a metal ion increases, its electronegativity also increases. Therefore, a transfer of charge from O2- to Mn+ ion may occur in the lower energy region (visible region).

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