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

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

Grade:9

2 Answers

Sunil Kumar FP
askIITians Faculty 183 Points
9 years ago
element which undegoes simultaneous oxidation-reduction reaction is said to undergo disproportion reaction.
(1)3Cro4- + 8H+ -------2CrO4^2- + Cr+3 + 4H20
(2)3MnO4^2- +4H+ --------2MnO4- +MnO2 +2H20
Aadil Arsh
11 Points
6 years ago
Answer:A disproportionation reaction is a redox reaction in which one species undergoes BOTH oxidation and reduction.Explanation:This is best illustrated by an actual example. Chlorine gas is known to undergo disproportionation in alkaline conditions to give chloride and chlorate ions.Reduction12Cl2(g)+e−→Cl− (i)Oxidation12Cl2(g)+6HO−→ClO−3+5e−+3H2O (ii)And 5×(i)+(ii) gives:3Cl2(g)+6HO−→5Cl−+ClO−3+3H2OWhich is balanced with respect to mass and charge, as is always required. Clearly zerovalent chlorine gas has undergone reduction to chloride ion, and oxidation to chlorate ion; i.e. a disproportionation reaction.

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