Question

Pyrolusite is `MnO_(2)` used to prepare `KMnO_(4)` step are:
`MnO_(2)undersetto(I)MnO_(4)^(2-)undersetto(II)MnO_(4)^(-)`
Step I and II are respectively:
A. Fuse with `KOH`/air, electrolytic oxidation
B. fuse with `KOH//KNO_(3)`, electrolytic reduction
C. fuse with concentrated `HNO_(3)`/ air , electrolytic reduction
D. dissolve in `H_(2)O`. oxidation

Answer 1

Correct Answer - AB
`2MnO_(2)+4KOh+O_(2)(KCO_(3)) to 2K_(2)MnO_(4)+2H_(2)O`.
`MnO_(4)^(2-)underset("oxidation") overset("electrolytic")to MnO_(4)^(-) +e^(-)`.