By which of the following $\mathrm{SO}_{2}$ is formed?

By which of the following $\mathrm{SO}_{2}$ is formed?
  1. Reaction of dil. $\mathrm{H}_{2} \mathrm{SO}_{4}$ with $\mathrm{O}_{2}$
  2. Hydrolysis of dil. $\mathrm{H}_{2} \mathrm{SO}_{4}$
  3. Reaction of conc. $\mathrm{H}_{2} \mathrm{SO}_{4}$ with $\mathrm{Cu}$
  4. None of these

Solution

$\begin{aligned} \mathrm{Cu}+2 \mathrm{H}_{2} \mathrm{SO}_{4}(\mathrm{conc}) \longrightarrow \mathrm{CuSO}_{4}+\mathrm{SO}_{2}+2 \mathrm{H}_{2} \mathrm{O} \end{aligned}$ ^

Asked in: JEE-TOPICTESTS-CHEMISTRY

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