When $M n O_{2}$ is fused with KOH and $K N O_{2}$ , a coloured compound is formed, the product and its colour is:

K_{2} M n O_{4}

, green

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K M n O_{4}

, purple

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M n_{2} O_{3}

, brown

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M n_{3} O_{4}

, black

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Solution

The correct option is B $K_{2} M n O_{4}$ , green
Reaction:
$M n O_{2} + 2 K O H + K N O_{3} \to H_{2} O + K_{2} M n O_{4} + K N O_{2}$
green

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

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