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Why is potssium permanganate thermally u...

Why is potssium permanganate thermally unstable at 513 K.

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At 513K, potassium permanganate undergoes disproportionation reaction. The product are more stable than the reactants.
`overset (+7)(2K MnO_(4)) overset(513 K) to overset(+6)(K_(2)MnO_(2))+O_(2)`
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DINESH PUBLICATION-D-AND -F BLOCK ELEMENTS-Question From Board Examination
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