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Question
How does the potassium permanganate salt react towards conc. H2SO4?
Short Answer
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Solution
It produces manganese heptoxide (Mn2O7) when exposed to cold and concentrated H2SO4, which can break down into manganese dioxide and oxygen.
\[\ce{2KMnO4 + H2SO4 ->[Cold] Mn2O7 + K2SO4 + H2O}\]
\[\ce{2Mn2O7 -> 4MnO2 + 3O2}\]
When warmed gently with conc. H2SO4 gives oxygen.
\[\ce{4KMnO4 + 6H2SO4 ->[Warm] 2K2SO4 + 4MnSO4 + 6H2O + 5O2}\]
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