When $M n O_{2}$ is fused with $K O H$ , a coloured compound is formed. The product and its colour are, respectively :

K_{2} M n O_{4}

, purple 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 A $K_{2} M n O_{4}$ , purple green
When $M n O_{2}$ is fused with $K O H$ , a purple green coloured $K_{2} M n O_{4}$ is formed. The reaction is given below:
$2 M n O_{2} + 4 K O H + O_{2} \to 2 K_{2} M n O_{4} + 2 H_{2} O$ .

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