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

Explanation

When a particular oxidation state becomes less stable relative to other oxidation states, one lower, one higher, it is said to undergo disproportionation. For example, manganese (VI) becomes unstable relative to manganese(VII) and
manganese (IV) in acidic solution.
`3Mn^(VI)O_(4)^(2-)+4H^(+)to2Mn^(VII)O_(4)^(-)+Mn^(IV)O_(2)+2H_(2)O`