1.

Give theionicreactionof electrolytic ofaqueoussolutionof KMnO_(4)

Answer»

Solution :In themethodaqueoussolutionof potassiummanganateis electrolyzedin thepresenceoflittlealkali.
`K_(20MnO_(2)hArr2K^(+)+ MnO_(4)^(2-)`
`H_(2)O hArrH^(+) +OH^(-)`
Manganateions are converted intopermanganateions at anode.
`MnO_(4)^(2-)hArrMnO_(4)^(-)+ e^(-)`
`H_(2)` isliberatedat the cathode.
`2H^(+)+ 2e^(-)to H^(2) `
Thepurplecoloured solutionis concentratedby evaporationand formcrystalsof potassiumpermanganateon COOLING .


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