When XO2 is fused with an alkali metal hydroxide in presence of an oxidizing agent such as KNO3, a dark green product is formed which disproportionates in acidic solution to afford a dark purple solution. X is

MnO2+2KOH+KNO3→K2MnO4 (Green) +KNO2+H2OMnO42−+4H+→2MnO4− (Purple) +MnO2+2H2O

When XO2 is fused with an alkali metal hydroxide in presence of an oxidizing agent such as KNO3, a dark green product is formed which disproportionates in acidic solution to afford a dark purple solution. X is

MnO2+2KOH+KNO3→K2MnO4 (Green) +KNO2+H2OMnO42−+4H+→2MnO4− (Purple) +MnO2+2H2O

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When XO₂ is fused with an alkali metal hydroxide in presence of an oxidizing agent such as KNO₃, a dark green product is formed which disproportionates in acidic solution to afford a dark purple solution. X is

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$\begin{aligned} {MnO}_{2} + 2 KOH + {KNO}_{3} \to \underset{(Green)}{K_{2} {MnO}_{4}} + {KNO}_{2} + H_{2} O \\ {MnO}_{4}^{2 -} + 4 H^{+} \to \underset{(Purple)}{2 {MnO}_{4}^{-}} + {MnO}_{2} + 2 H_{2} O \end{aligned}$

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When XO2 is fused with an alkali metal hydroxide in presence of an oxidizing agent such as KNO3, a dark green product is formed which disproportionates in acidic solution to afford a dark purple solution. X is

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When XO₂ is fused with an alkali metal hydroxide in presence of an oxidizing agent such as KNO₃, a dark green product is formed which disproportionates in acidic solution to afford a dark purple solution. X is