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Explain the preparation of potassium per...

Explain the preparation of potassium permanganate from `MnO_(2)` Write the balanced chemical equations for the reactions involved. 

Text Solution

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`KMnO_(4)` is manufactured from pyrolusite
Step 1= Pyrolusite is powdered and fused with KOH in presence of `KNO_(3)` as an oxidizing agent to form potassium manganate
`MnO_(2)+4KOH+O_(2)rarr 2K_(2)MnO_(4)+2H_(2)O`
Step 2 = The potassium manganate undergoes disproportionation in acidid or neutral medium to give permanganate.
`MnO_(4)^(2-)+4H^(+)rarr2MnO_(4)^(-)+MnO_(2)+2H_(2)O`
The purple solution so obtained is concentrated to get dark purple crystals of `KMnO_(4)`
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