Concept:Sulphur(IV) oxide is a versatile gas, and one of its notable applications is in refrigeration systems.
Explanation:Sulphur(IV) oxide,
SO2, is a gas at room temperature but can be easily compressed and condensed into a liquid.
It has a high heat of evaporation, meaning it absorbs a large amount of heat when it vaporizes.
This property makes it very effective as a refrigerant, as it can remove heat from the surroundings during the evaporation cycle.
While
SO2 is also used in food preservation and making sulphuric acid, it is not used as a coating agent, dehydrating agent, or drying agent in the same common sense as the other options.
Therefore, among the choices provided, the best description of its use is as a refrigerant.
Answer:C. refrigerant