The oxidation number of Mn in the product of alkaline oxidative fusion of MnO2 is
Reaction involved for the product of alkaline oxidative fusion of manganese dioxide
2MnO2 + 4KOH + O2 → K2MnO4 + 2H2O
Product : K2MnO4 or MnO4 2-
Thus oxidation state of Mn in MnO4 2-
X = Mn
X + 4 x (-2) = -2
X = 6
Mn exist in +6 State