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Q.

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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a

MnO2 and yellow

b

 K2MnO4 and dark green

c

 MnO2O3 and brown

d

 KMnO4 and purple

answer is A.

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Detailed Solution

2MnO2 +4KOH +O2   →  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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