The Mn3+ ion is unstable in solution and undergoes disproportionation to give Mn2+, MnO2, and H+ ion. Write a balanced ionic equation for the reaction.


The given reaction can be represented as follows:


The oxidation half equation is:-



The oxidation number is balanced by adding one electron as:



The charge is balanced by adding 4H+ ions as:



The O atoms and H+ ions are balanced by adding 2H2O molecules as:



The reduction half equation is:



The oxidation number is balanced by adding one electron as:



The balanced chemical equation can be obtained by adding oxidation and reduction half equations to get the desired equation as: -



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