1.

Explain the action of Conc. H_(2)SO_(4) on potassium permanganate.

Answer»

Solution :(i) On treating with cold conc.`H_(2)SO_(4)` it decomposes to form MANGANESE heptoxide, which subsequently decomposes explosively.
`2KMnO_(4)+ underset("(cold)")(2H_(2)SO_(4)) to underset("(Manganese Heptaoxide)")(Mn_(2)O_(7))+ 2KHSO_(4)+ H_(2)O`
`Mn_(2)O_(7) overset(Delta) to underset("(Manganese dioxide)")(2MnO_(2))+3O_(2)`
(ii) With hot Conc.`H_(2)SO_(4)` potassium PERMANGANATE GIVE `MnSO_(4)` [Manganese(II) sulphate)
`KMnO_(4)+ underset("(Hot)")(6H_(2)SO_(4)) to 4MnSO_(4)+ 2K_(2)SO_(4)+ 6H_(2)O+ 5O_(2)uarr`


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