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Name the gas that can readily decolouris...

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

A

`CO_2`

B

`SO_2`

C

`NO_2`

D

`P_2O_5`

Text Solution

Verified by Experts

The correct Answer is:
B
`KMnO_4` is an oxidising so it can oxidise` SO_2` readily
`KMnO_4 + SO_2 to Mn^(2+) + SO_3`
`NO_2` is strog oxidising agent, `CO_2` is neither oxidising agent nor reducing agent.
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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 ?

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