The color of KMnO4 is due to:

The color of KMnO4 is due to charge transfer transitions by absorption of visible light. The metal ions in KMnO4 containing d electron and therefore charge transfer takes place 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 metal ion increases, its electronegativity also increases and therefore a transfer of charge from O2- to Mn+ ion may take place in lower energy region (visible region).

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