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Why it is not advisable to dissolve `KMnO_(4)` in cold and concentrated `H_(2)SO_(4)`

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Why it is not advisable to dissolve `KMnO_(4)` in cold and concentrated `H_(2)SO_(4)`
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Correct Answer - Because explosive `Mn_(2)O_(7)` is formed.
`2KMnO_(4)+2H_(2)SO_(4)toMn_(2)O_(7)+2KHSO_(4)+H_(2)O`
`2Mn_(2)O_(7)to4MnO_(7) to 4MnO_(2)+3O_(2)`
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