Q. 46

A solution of KMnO4 on reduction yields either acolourless solution or a brown precipitate or a green solution depending on pH of the solution. What different stages of the reduction do these represent and how are they carried out?

Answer :

In acidic medium, permanganate changes to manganous ion which is colourless.

MnO4-+8H+ + 5e- Mn2+ + 4H2O


In alkaline medium, permanganate changes to manganate, which is a green solution

MnO4-+ e- MnO42-


In neutral medium, permanganate changes to manganese dioxide which is a brown precipitate,

MnO4-+ 2H2O + 3e- MnO2 + 4OH-


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