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Potassium Permanganate

When MnO2 is ...

Question

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

A

$K_{2} M n O_{4}$ Purple green

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B

$K M n O_{4}$ Purple

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C

$M n_{2} O_{3}$ Brown

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D

$M n_{3} O_{4}$ Black

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Solution

The correct option is A
$K_{2} M n O_{4}$ Purple green

$M n O_{2}$ is oxidised to $K_{2} M n O_{4}$ in alkaline medium to acquire a stable oxidation state of +6

$2 M n O_{2} + 4 K O H + O_{2} \to 2 K M n O_{4} + 2 H_{2} O$

The colour of the solution is light purple green.

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