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What is meant by 'disproportionation'? Give two examples of disproportionation reaction in aqueous solution.

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What is meant by 'disproportionation'? Give two examples of disproportionation reaction in aqueous solution.

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It is found that sometimes a relatively less stable oxidation state undergoes an oxidation - reduction reaction in which it is simultaneously oxidised and reduced. This is called disproportionation.

For example,

3CrO43+ + 8H+ → 2CrO42- + Cr3++ 4H2O

Cr(V)                     Cr(VI)      Cr(III)

Cr(V) is oxidized to Cr(VI) and reduced to Cr(III).

(ii) 3MnO42- + 4H+ → 2MnO4- + MnO2 + 2H2O

    Mn(VI)                   Mn(VII)        Mn(IV)

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

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