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Potassium manganate (K2MnO4) is formed w...

Potassium manganate `(K_2MnO_4)` is formed when

A

Chlorine is passed through aqueous `KMnO_4` solution

B

Manganese dioxide is fused with potassium hydroxide in air.

C

Formaldehyde reacts with potassium permanganate in the presence of a strong alkali.

D

Potassium permanganate reacts with concentrated sulphuric acid.

Text Solution

Verified by Experts

The correct Answer is:
B, C
Potassium maganate `(K_2MnO_4)` is formed when mangnese dioxide is fused with potassium hydroxide in air of formaldehyde reacts with potassium permanganate in the presence of a strong alkali.
`4KOH+2MnO_2+O_2to2K_2MnO_4+2H_2O`
`HCHO+2KMnO_4+2KOHtoK_2MnO_4+H_2O+HCOOH`
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Knowledge Check

  • Potassium manganate (K_(2)MnO_(4)) is formed when

    A
    chlorine is passed into aqueous `KMnO_(4)` solution
    B
    manganese dioxide is fused with potassium hydroxide in air
    C
    formaldehyde reacts with potassium permanganate in presence of a strong alkali
    D
    potassium permanganate reacts with concentrated sulphuric acid.

  • Potassium manganate (K_(2)MnO_(4)) is formed when:

    A
    potassium permanganate reacts with formaldehyde in acidic medium
    B
    Manganese dioxide is fused with potassium hydroxide in air.
    C
    Manganese hydroxide reats with `K_(2)O_(2)` in alkaline medium.
    D
    Potassium permanganate is heated at 750K

  • The Potassium manganate (K_(2) MnO_(4)) is formed, when

    A
    `Cl_(2)` is passed into an aqueous solution of `KMnO_(4)`.
    B
    `MnO_(2)` is fused with KOH.
    C
    formaldehyde reacts with `KMnO_(4)` in the presence of strong alkali.
    D
    `KMnO_(4)` reacts with concentrated `H_(2)SO_(4)`

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    Given below are two statements : Statement I : Potassium permanganate on heating at 500K forms potassium manganate. Statement II : Both potasium permanganate and potassium manganate are tetrahedral and paramaganetic in nature. In the light of the above statement, choose the most appropriate answer from the options given below :

    Potassium manganite (K_(2)MnO _(3)) is formed when

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    Postassium permanganate is manufactured a large scale by fusing - with KOH and KNO_(3) to form K_(2)MnO_(4) , which is than electrolytically oxidized in an alkaline medium.

    In the titration between oxalic acid ad acidified potassium permanganate, the manganous salt formed catalyses the reaction. The manganous salt is:-

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