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Potassium manganate (K2MnO4) is formed w...

Potassium manganate `(K_2MnO_4)` is formed when

A

chlorine is passed in to aqueous `KMnO_4`

B

manganese dioxide is fused with potassium hydroxide in air

C

formaldehyde reacts with potassium permanganate in presence or a strong alkali

D

potassium permanganate reacts with concentrated sulphuric acid

Text Solution

Verified by Experts

The correct Answer is:
B
`K_2MnO_4` is formed when `MnO_2` is fused with KOH in air .
`2MnO_2 + 4KOH +O_2 to 2K_2MnO_4 + 2H_2O`
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MARVEL PUBLICATION-D AND F BLOCK ELEMENTS -TEST YOUR GRASP
  1. Potassium manganate (K2MnO4) is formed when

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  2. The number of transition series in the periodic table are

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  3. What is the general electronic configuration of transition elements

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  4. Each transition series contains only 10 elements because

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  5. Which one of the following refers to configuration of transition elem...

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  6. The outer electronic configuration of chromium is

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  7. Which of the following does NOT show different oxidation states?

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  8. Calculate the oxidation number of Mn in KMnO(4) molecule.

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  9. The properties of transition metals are in between the properties of ...

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  10. Which transition metal shows the highest oxidation state ?

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  11. Which of the following would be diamagnetic?

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  12. The element present immediately below Zn in the periodic table in the ...

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  13. Oxidation state of +1 is possible with

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  14. For Sc (2 1), if both 3d and 4s electrons in involved in bonding, the ...

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  15. Which one of the following forms a colourless solution in aqueous medi...

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  16. Which of the following group belongs to transition series ?

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  17. In transition elements, the differentiating electron enters into subs...

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  18. Which of has the highest number of unpaired electrons?

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  19. The range of wavelength of the visible light is

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  20. Which of the following salt give coloured aqueous solution ?

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  21. Sulphide ore of Zinc is

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