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Potassium manganate (K2 MnO4) is formed ...

Potassium manganate `(K_2 MnO_4)` is formed when

A

chlorine is passed through aqueous `KMnO_4` solution.

B

manganese dioxide is heated with potassium hydroxide in air.

C

formaldehyde reacts with potassium permanganate in presence of strong alkali.

D

potassium permanganate reacts with `H_2 SO_4`

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The correct Answer is:
B, C
Preparation of `K_2 MnO_2 `
`2 Mn O_2 + 4 KOH _O_2 to 2 K_2 MnO_(4) + 2H_2 O`
` 2 KMnO_(4) + 2 KOH to 2 K_2 MnO_(4) + H_2 O + [O] HCHO + [O] to HCOOH`
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BRILLIANT PUBLICATION-THE D-AND F-BLOCK ELEMENTS-QUESTIONS (LEVEL-III)
  1. The correct statements about Cr^(2+) and Mn^(3+) is (are) (Atomic numb...

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  2. Which of the following salt solutions will be coloured?

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  3. Potassium manganate (K2 MnO4) is formed when

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  4. The magnetic moment of a metal ion of first transition series is 2.83 ...

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  5. The coefficient of H2 SO4 on balancing the following equation is .......

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  6. The number of electrons present in the 5f orbital in ground state of N...

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  7. The oxidation number of Mn in the product of alkaline oxidative fusion...

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  8. The number of water molecule(s) directly bonded to the metal centre in...

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  9. Out of the following, how many of them have magnetic moment value sqrt...

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  10. Out of the following how many oxides are basic: TiO,Sc2 O3,Ti2O3, , ...

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  12. This section contains questions each with two columns-I and II. Match ...

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  13. This section contains questions each with two columns-I and II. Match ...

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  14. This section contains questions each with two columns-I and II. Match ...

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  15. This section contains questions each with two columns-I and II. Match ...

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  17. Assertion : Anhydrous copper (II) chloride is covalent while anhydrous...

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  18. Statement-1 : Ce^(3+) cannot be easily oxidised to Ce^(4+) . Statement...

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  19. Assertion : In acidic medium, K2 Cr2 O7 " exists as " Cr2 O7^(2-) (ora...

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  20. Assertion : The purple colour of KMnO4, is due to the charge transfer ...

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