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What is meant by ‘disproportionation’ of...

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 oxidaito states, one lower, one higher. It is said to undergo disproportionation.
e.g.,`3Mn.^(VI)O_(4)^(2-)+4H^(+)to2Mn.^(VII)O_(4)^(-)+Mn.^(VI)O_(2)+2H_(2)O`
Mn (VI) is unstable relative to Mn (VII) and Mn (VI).
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