Fusion of $MnO_2$ with $KOH$ in the presence of air or an oxidizing agent like $KNO_3$ forms a colored compound. Identify the product and its color.
- A$K_2MnO_4$,Green
- B$KMnO_4$,Purple
- C$Mn_2O_3$,Brown
- D$Mn_3O_4$,Black
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