KMnO4 is coloured due to ______.

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KollegeApply · Accepted Answer

KMnO4 is coloured due to charge transfer from ligand to metal. Explanation: The Mn atom in KMnO4 has a +7 oxidation state with electron configuration [Ar]3d04s0. Since no unpaired electrons are present, d−d transitions are not possible. The molecule should, therefore, be colourless. Its intense purple due to "L"→"M" (ligand to metal) charge transfer 2p(L) of O to 3d(M) of Mn.

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