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Identify the product and the colour when...

Identify the product and the colour when `MnO_(2)` is fused with solid KOH in the presence of oxygen `(O_(2))`

A

`KMnO_(4)`, purple

B

`K_(2)MnO_(4)` , dark green

C

MnO, colourless

D

`Mn_(2)O_(3)` ,brown

Text Solution

Verified by Experts

The correct Answer is:
B
`2MnO_(2) + 4KOH + O_(2) rarr underset("Pot. manganate (Green)")(2K_(2)MnO_(4))+ 2H_(2)O`
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MnO_(2) is the most important oxide of manganese , MnO_(2) occurs natually as the black coloured mineral pyrolusite. It is an oxidising agent, and decomposes to Mn_(3)O_(4) on heating to 530^(@) C. It is used in the preparation of potassium permanaganate and in the productioon of Cl_(2) gas. Over half million tonnes per year of MnO_(2) is used in dry batteries. Q. When MnO_(2) is fused with KOH in the presence of air, the product formed is:

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PRADEEP-D- AND F-BLOCK ELEMENTS-COMPETITIONS FOCUS
  1. The bonds present in the structure of dichromate ion are

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  2. Which of the following does not give oxygen on heating ?

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  3. Identify the product and the colour when MnO(2) is fused with solid KO...

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  4. KMnO(4) can be prepared from K(2)MnO(4) as per the reaction 3MnO(4)^...

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  5. When a mananous salt is fused with a mixture of KNO(3) and and solid N...

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  6. In acidic medium MnO(4)^(2-)

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  7. The coloured spot ofKMnO(4) on any article can be bleached by

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  8. MnO(4)^(-) reacts with Br^(-) in alkaline pH to give

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  9. Amount of oxalic acid present in a solution can be determined by its t...

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  10. An explosion takes place when conc. H(2)SO(4) is added to KMnO(4) due ...

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  11. KMnO(4)gets reduced to

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  12. The colour of KMnO(4) is due to

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  13. In acidic medium, H(2)O(2) changes Cr(2)O(7)^(2-) to CrO(5) which has ...

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  14. The reaction of aqueous KMnO(4) with H(2)O(2) i acidic conditions give...

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  15. Name the gas that can readily decolourise acidified KMnO(4) solution:

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  16. Gadolinium belongsd to 4f series. It's atomic number is 64. which of t...

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  17. The electronic configuration of Eu (Atomic No. 63), Gd (Atomic No. 64)...

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  18. Cerium (Z= 58) is an important nember of the lanthanoids . Which of th...

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  19. The atomic number of cerium (Ce) is 58. The correct electronic con...

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  20. The electronic configuration of Gd^(2+)is :

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