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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
In presence of moisture, `SO_(4)` acts as a good reducing agent. Its reducing character is due to evoution of nascent hydrogen:
`SO_(2) + 2H_(2) O rarr H_(2) SO_(4) + 2 [H]`
It decolurises pind violet colour of acidified `KMnO_(4)` solution
`2 KMnO_(4) + 3 H_(2) SO_(4) rarr K_(2) SO_(4) + 2 MnSO_(4) + 3 H_(2) O + 5[O]`
`underline(SO_(2) + H_(2) O + [O] rarr H_(2) SO_(4) xx 5)`
`underset("Pink violet")(2KMnO_(4) + 5 SO_(2)) rarr K_(2) SO_(4) _ underset("colorless")(2MnSO_(4)) + 2 H_(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.

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Knowledge Check

  • Name of gas that can readily decolorise acidified KMnO_(4) solution

    A
    `CO_(2)`
    B
    `SO_(2)`
    C
    `NO_(2)`
    D
    `P_(2)O_(5)`

  • If (X) decolourises acidfied KMnO_(4) solution , then X may

    A
    `S^(2-)`
    B
    `SO_(3)^(2-)`
    C
    `Fe^(2+)`
    D
    `SO_(2)`

  • Which of the following radical(s) on reaction with dil HCl liberate(s) gas which decolourize(s) acidified KMnO_(4) solution.

    A
    `S_(2)O_(3)^(2-)`
    B
    `NO_(2)^(-)`
    C
    `Br^(-)`
    D
    `HCO_(3)^(-)`

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    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 ?

    An amorphous solid ‘A’ burns in air to form a gas ‘B’ which turns lime water milky. The gas is also produced as a by-product during roasting of sulphide ore. This gas decolourises acidified aq. KMnO_(4) solution. Identify the solid ‘A’ and the gas ‘B’ and write the reaction involved. Write its any two uses.

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