8.22 What is meant by ‘disproportionation’? Give two examples of disproportionation reaction in aqueous solution.

Step 1:
Disproportionation is a chemical reaction, typically a redox reaction, in which a substance is simultaneously oxidized and reduced, giving two different products.

Step 2:

For example,

(i) 2Cu+ → Cu2+ + Cu

(ii)3MnO42-+4H+2MnO42-+MnO2+2H2O
Mn(lV)Mn(Vll)Mn(lV)

Mn (VI) is oxidized to Mn (VII) and reduced to Mn (IV).