$KMnO _4$ decomposes on heating at $513 K$ to form $O _2$ along with
(1) $MnO _2 \& K _2 O _2$
(2) $K _2 MnO _4 \& Mn$
(3) $Mn \& KO _2$
(4) $K _2 MnO _4 \& MnO _2$
$KMnO _4 \stackrel{\Delta}{\rightarrow} K _2 MnO _4+MnO _2+O _2$
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