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Pyrolusite is MnO(2) used to prepare KMn...

Pyrolusite is `MnO_(2)` used to prepare `KMnO_(4)`. Steps are, `MnO_(2)overset(I)(rarr)MnO_(4)^(2-)overset(II)(rarr)MnO_(4)^(-)` Steps I and II are respectively`:`

A

fuse with KOH air and electrolytic oxidation

B

fuse with KOH `KNO_3` and electrolytic oxidation

C

fuse with conc. `HNO_3` air and electrolytic reduction

D

dissolve in `H_2O` and oxidation

Text Solution

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The correct Answer is:
A,B
Fuse with KOH in presence of air or oxidising agents like `KNO_3, KClO_3` etc.
`2MnO_2 +4KOH+O_2overset("fuse")to2K_2MnO_4+2H_2O`
`MnO_4^(2-)overset("electrolytic solution")toMnO_4^(-)+e^-`
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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:

overset (MnO_(2)) Product

overset (MnO_(2)) Product

KMnO_(4) overset(Delta) to K_(2)MnO_(4)+MnO_(2)+O_(2)uarr

The product 'A' in the equation" 2KMnO_(4)overset(Delta)rarrA+MnO_(2)+O_(2)

2mNo_(4)^(2-)+cl _(2) rarr Mn^(2+)+5Fe^(3+) MnO_(4)^(2-) can be converted to MnO_(4)^(-)

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