What is meant by ‘disproportionation’? Give two examples of disproportionation reaction in aqueous solution.
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The disproportionation reaction is the redox reaction and in it one species undergoes both of the reduction and oxidation.
Chlorine gas undergoes disproportionation in the alkaline conditions to provide chlorate and chloride ions.
Two examples of the disproportionation reaction in the aqueous solution are Reduction - 12Cl2(g)+e−→Cl−
(i)Oxidation 12Cl2(g)+6HO−→ClO−3+5e−+3H2O
(ii) And 5 × (i)+(ii) gives - 3Cl2(g)+6HO−→5Cl−+ClO−3+3H2O.
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The decomposition of hydrogen peroxide involves both the oxidation and reduction of oxygen. Therefore, we can conclude that the decomposition of hydrogen peroxide is an example of disproportionation.
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