Question

Why KMnO4 is coloured in +7 oxidation state and colourless in +2 state???

Answer 1

Answer:

The color in KMnO4 arises from an electronic transition.

In the permanganate ion (MnO4-), manganese is in the +7 oxidation state, so it has no d electrons. Photons promote an electron from the highest energy molecular orbital to an empty d orbital on the manganese. When a photon of light is absorbed, this charge transfer takes place from L to M.

Explanation:

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