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When MnO2 is fused woth KOH, a coloured ...

When `MnO_2` is fused woth `KOH`, a coloured compound is formed, the product and its colour are

A

`k_(2)MnO_(4)`, green

B

`Mn_(2)O_(3)`brown

C

`Mn_(2)O_(4)`,black

D

`KMnO_(4)`,purple

Text Solution

Verified by Experts

The correct Answer is:
1
Pyrolusite on fusion with `KOH` in air gives green coloured manganate.
`2MnO_(2)+4KOH+O_(2)rarr2K_(2)MnO_(2)("green")+2H_(2)O`
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RESONANCE-D & F BLOCK ELEMENTS-INORGANIC CHEMISTRY(d & f- Block Elments)
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  2. Which one of the following compounds does not decolourise an acidified...

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  3. When MnO2 is fused woth KOH, a coloured compound is formed, the produc...

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  4. The basic character of the transition metal monoxide follows the order

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  5. Which of the following reactions represents " developing"in photograph...

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  6. Which of the following ions are colourless in the aqueous solutions ?

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  7. Which of the following factor may be regarded as the main cause of lan...

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  8. Why does ZnO show increased electrical conductivity and turns yellow o...

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  9. Which of the following is arranged in order of incresing melting point...

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  10. In which of the following reaction "Philosopher's wool" is formed

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  11. CrO3 dissolves in aqueous NaOH to give

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  12. Mercury on heating with aqua regia gives

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  13. The formula of azurite is :

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  14. Oxide of metal cation which is not amphoteric ?

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  15. The ratio of mass of a diamagnetic substance in a magnetic field to it...

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  16. CrO(4)^(2-) (yellow) changes to Cr(2)O(7)^(2-)(orange ) in pH=y . Henc...

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  17. An excess of Na(2)S(2)OO(3) react with aqueous CuSO(4) to give

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  18. [Cr(H2 O)6]Cl3 (at no. of Cr = 24) has a magnetic moment of 3.83 B.M. ...

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  19. Potassium manganate (K2MnO4) is formed when

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  20. Uub is the symbol for the element with atomic number-

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