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What is meant by disproportionation of a...

What is meant by disproportionation of an oxidation state ? Give an example

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When a particular oxidation state becomes less stable relative to other oxidation states, one lower and one higher, it is said to undergo disproportionation. For example, manganese (VI) becomes unstable relative to manganese (VII) and manganese (IV) in acidic solution
`overset(VI)(3MnO_4^(2-)) + 4H^(+) to overset(VII)(2MnO_4^(-) + overset(IV)(MnO_2) + 2H_2O`
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