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here is the rection...

2KMnO4 + 3H2SO4 = K2SO4 + 2MnSO4 + 3H2O + 2.5O2 (alkaline)

and in other conditions...

6 KMnO4 + 9 H2SO4 → 6 MnSO4 + 3 K2SO4 + 9 H2O + 5 O3

The H2SO4/KMnO4 reaction can also produce the oily Mn2O7, which is unstable and can decompose explosively.

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