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Question

When MnO2 is fused with KOH, a coloured compound is formed. The product and its colour are, respectively :

A
K2MnO4, purple green
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B
KMnO4, purple
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C
Mn2O3, brown
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D
Mn3O4, black
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Solution

The correct option is A K2MnO4, purple green
When MnO2 is fused with KOH, a purple green coloured K2MnO4 is formed. The reaction is given below:
2MnO2+4KOH+O22K2MnO4+2H2O.

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