In which of the following reactions is sulphur dioxide released?

Oxidation of C by conc. sulphuric acid

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Copper with conc. sulphuric acid

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Zinc with dilute sulphuric acid

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Oxidation of S by conc. nitric acid

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Solution

The correct options are
A
Oxidation of C by conc. sulphuric acid

B
Copper with conc. sulphuric acid

When conc. sulphuric acid acts as an oxidising agent, it itself undergoes reduction and gets reduced to $S O_{2}$ . In options A and B, conc. sulphuric acid is acting as oxidising agent.

$C + c o n c .2 H_{2} S O_{4} ⟶ 2 S O_{2} + 2 H_{2} O + C O_{2}$

$C u + c o n c .2 H_{2} S O_{4} ⟶ S O_{2} + 2 H_{2} O + C u S O_{4}$

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Similar questions

Copper does not react with conc. sulphuric acid but reacts with the dilute acid

Dilute sulphuric acid is more corrosive than conc. sulphuric acid.

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