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Name the gas that can readily decolouris...

Name the gas that can readily decolourise acidified `KMnO_(4)` solution:

A

`SO_(2)`

B

`NO_(2)`

C

`P_(2)O_(5)`

D

`CO_(2)`

Text Solution

Verified by Experts

The correct Answer is:
A
Potassium permanganate has a purplse colour. When sulphur dioxide reacts with potassium permanganate the solution decolourises.
`SO_(2) + 2KMnO_(4) + 2H_(2)O rarr 2H_(2)O rarr 2H_(2)SO_(4) + 2MnSO_(4) + K_(2)sO_(4)`
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An aqueous solution of gas ‘A’ gave the following data (reactions): It decolourised an acidified KMnO_(4) solution.

An aqueous compound of an inorganic compound (X) shows the following reactions: a. it decolourises and acidified KMnO_(4) solution accompanied by the evolution of oxygen. b. it liberates I_(2) from an acidified KI solution. c. It gives a brown precipitate with alkaline KMnO_(4) solution with evolution of oxygen. d. It removes black stains from old oil paintings. Identify (X) and give chemical equtions for the reaction at steps (a) to (d).

Why can’t HCl acid be used to acidify KMnO_(4) solution ?

DISHA PUBLICATION-THE D- AND F- BLOCK ELEMENTS -EXERCISE - 1 CONCEPT BUILDER (TOPIC 2 : COMPOUNDS OF TRANSITION METALS)
  1. The oxoanion in which the oxidation state of the central atom is same ...

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  2. When an aqueous solution of copper (II) sulphate is saturated with amm...

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  3. When concentrated HCI is added to an aqueous solution of CoCl(2...

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  4. Colourless solutions of the following four salts are placed separately...

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  5. The correct statements of the following

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  6. Among the following, the compound that is both paramagnetic and colour...

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  7. K(2)Cr(2)O(7) on heating with aqueous NaOH gives

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  8. What would happen when a solution of potassium chromate is treated wit...

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  9. The oxidation state of chromium in the final product formed by the rea...

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  10. The final products formed on the addition of KI to copper sulphate sol...

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  11. KMnO(4) (acidic / alkaline ) is not decolurised by

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  12. Acidified K(2)Cr(2)O(7) solution turns green when NasO(3) is added to ...

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  13. KMnO4 can be prepared fromK2MnO4 as per the reaction: The reaction ...

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  14. The pair of compounds that can exist together is:

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

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

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  17. Which of the following processes does not involve oxidation of iron ?

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  18. Assuming complete ionization , same moles of which of the following co...

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  19. Which one of the following statements is correct when SO(2) is passed ...

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

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