A solution of KMnO4 on reduction yields either


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


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

MnO4-+ 2H2O + 3e-→ MnO2 + 4OH-


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