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Oh heating pyrolusite with KOH in presen...

Oh heating pyrolusite with `KOH` in presence of air we get

A

`KMnO_(4)`

B

`K_(2) MnO_(4)`

C

`Mn (OH)_(2)`

D

`Mn_(3) O_(4)`

Text Solution

Verified by Experts

The correct Answer is:
B
`underset("pyrollusite")MnO_(2) + KOH rarr K_(2) MnO_(4)`
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Potassium permanganate is prepared by fusing pyrolusite with caustic potash in the presence of air or some oxidising agent which gives a green mass. The green mass is then extracted with water and treated with a current of Cl_2 to form potassium permanganate. In the laboratory, it is prepared by oxidising a manganese (II) salt by peroxosulphate. It acts as an oxidising agent in neutral, alkaline or acidic solutions. Name the green mass obtained by heating pyrolusite with KOH in the presence of air and its reaction equation.

Knowledge Check

  • On heating Pyrolusite with KOH in the presence of air, we get

    A
    `KMnO_(4)`
    B
    `K_(2)MnO_(4)`
    C
    `Mn(OH)_(2)`
    D
    `Mn_(3)O_(4)`

  • Formation of a and beta methyl glucosides by glucose, on heating with CH_3 OH ,in presence of dry HCl gas indicates the presence of a/an

    A
    aldehyde group.
    B
    `CH_2OH` group
    C
    hemiacetal group.
    D
    acetal group.

  • For the reaction of phenol with CHCl_(3) in presence of KOH, the electrophile is

    A
    `overset(+)CHCl_(2)`
    B
    `:C"C"l_(2)`
    C
    `overset(cdot)CHCl_(2)`
    D
    `"C"Cl_(4)`

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