Which of the following is the key step in the manufacture of sulphuric acid?

Which of the following is the key step in the manufacture of sulphuric acid?
  1. Burning of sulphur or sulphide ores in air to generate $\mathrm{SO}_{2}$.
  2. Conversion of $\mathrm{SO}_{2}$ to $\mathrm{SO}_{3}$ by the reaction with oxygen in presence of catalyst.
  3. Absorption of $\mathrm{SO}_{3}$ in $\mathrm{H}_{2} \mathrm{SO}_{4}$ to give oleum.
  4. Both (b) and (c).

Solution

The key step in the manufacture of $\mathrm{H}_{2} \mathrm{SO}_{4}$ is catalytic oxidation of $\mathrm{SO}_{2}$ with $\mathrm{O}_{2}$ to give $\mathrm{SO}_{3}$ in presence of $\mathrm{V}_{2} \mathrm{O}_{5}$. .

Asked in: JEE-TOPICTESTS-CHEMISTRY

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