Identify the product and its colour when MnO_2 is fused with solid KOH in the presence of O_2. (a...

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Identify the product and its colour when MnO_2 is fused with solid KOH in the presence of O_2.
(a) KMnO_4, purple
(b) K_2MnO_4, dark green
(c) MnO, colourless
(d) Mn_2O_3, brown

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