Which among the following is NOT the use of $\mathrm{SO}_2$ gas?
Which among the following is NOT the use of $\mathrm{SO}_2$ gas?
As a preservative
In manufacture of $\mathrm{H}_2 \mathrm{SO}_4$
With conc. $\mathrm{H}_2 \mathrm{SO}_4$ it forms oleum
As an antichlor
Solution
Sulfur dioxide has the chemical composition of $\mathrm{SO}_2$ and is also commonly referred to as sulfurous acid anhydride, sulfurous anhydride, or sulfur oxide.
Uses of Sulphur Dioxide
In the food industries, as a food preservative.
It acts as a bleaching agent to remove the excess chlorine and as a disinfectant.
In cold storage plant, it acts as a refrigerant. It is used as a reagent and a solvent in the laboratory.
In the preparation of sulfuric acid, sulfur trioxide, and sulfites $\mathrm{SO}_3$ forms oleum with $\mathrm{H}_2 \mathrm{SO}_4$