$K M n O_{4}$ on heating gives:

K_{2} M n O_{4}

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M n O_{2}

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M n O

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M n_{2} O_{3}

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Solution

The correct option is B $M n O_{2}$
Potassium permanganate forms dark purple (almost black) crystals which are isostructural with those of $K C l O_{4}$ . The salt is not very soluble in water (6.4 g/100 g of water at 293 K), but when heated it decomposes at 513 K.
$2 K M n O_{4} Δ - \to K_{2} M n O_{4} + M n O_{2} + O_{2}$
Hence, option (a) and (b) are correct.

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