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Why is it not advisable to dissolve KMn...

Why is it not advisable to dissolve `KMnO_(4)` in conc.`H_(2) SO_(4)`

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.(KM) (mO)_(4).,reacts with conc. .(H)_(2) (SO)_(3). to form .(Mn)_(2) (O)_(7).. which on warming decomposes to .(MnO)_(2). .2 (KMnO)_(4)+2 (H)_(2) (SO)_(4) rarr (Mn)_(2) (O)_(7)+2 (KHSO)_(4)+(H)_(2) (O). .2 (Mn)_(2) (O)_(3) rarr 4 (MnO)_(2)+3 (O).
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