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When KMnO4 acts as an oxidising agent and ultimately forms [MnO4 ]^–1, MnO2 , Mn2O3 , Mn^2+

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When KMnO4 acts as an oxidising agent and ultimately forms [MnO4 ]–1, MnO2 , Mn2O3 , Mn2+ then the number of electrons transferred in each case respectively is

(a) 4, 3, 1, 5 

(b) 1, 5, 3, 7

(c) 1, 3, 4, 5 

(d) 3, 5, 7, 1.

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