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When MnO₂ is fused with KOH in the presence of air, a coloured compound is formed, the product and its colour is

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MnO₂ and yellow

K₂MnO₄ and dark green

MnO₂O₃ and brown

KMnO₄ and purple

answer is A.

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Detailed Solution

2MnO₂ +4KOH +O₂ $\to$ 2K₂MnO₄ +2H₂O

Mn has a +6 oxidation state here, and when it combines with an alkaline molecule in the presence of air oxygen, it produces purple green compounds.
As a result, MnO₂ bonded with KOH, forming 2 moles of purple green K₂MnO₄ and 2 moles of water.

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