When copper is reacted with conc. sulphuric acid, which gas is evolved?

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H 2

O 2

S O 2

S O 3

answer is C.

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Detailed Solution

Concept: Sulphur dioxide is created when concentrated sulfuric acid and copper combine, reducing

, which means concentrated sulphuric acid is the oxidising agent. The aqueous solution is where the copper (II) ions are created. Here is the redox reaction that occurs when Cu combines with concentrated

So it is clear that the gas produced by this reaction is sulphur dioxide.
Remember the fact that copper has a higher reduction potential than hydrogen lets us know that it does not react with diluted sulfuric acid. As a result, copper cannot remove hydrogen from non-oxidizing acids like diluted sulfuric acid.
Hence, the correct answer is option 3

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