(1) Passing O3 gas (strong oxidising agent) 2K2Mno4+O3+H2O⟶2KMno4+2KoH+O2 (2) Passing Cl2 gas (Oxidising Agent) 2K2Mno4+Cl2⟶2KMno4+2KCl (B) Electrolytic oxidation Mno42−⟶Mno4−+eΘ Hence, All the methods can be used to oxidise K2Mno4 to KMno4.