Q. Consider the following: - Aerosols
- Foam agents
- Fire retardants
- Lubricants
In the making of how many of the above are hydrofluorocarbons used? (UPSC Prelims 2023)
Answer:
Only three
Notes: The correct answer is
[C] Only three, according to the official UPSC answer key. While HFCs have technical applications in many fields, their primary industrial use as defined in environmental regulatory frameworks (like the Montreal Protocol) focuses on specific sectors.
- Aerosols (Correct): HFCs are widely used as propellants in medical inhalers and consumer spray products.
- Foam agents (Correct): HFCs are standard blowing agents used to create the cellular structure in plastic insulating foams.
- Fire retardants (Correct): HFCs serve as "clean agents" in total flooding fire suppression systems, especially for protecting electronic equipment.
- Lubricants (Incorrect/Excluded): While HFCs are compatible with certain synthetic lubricants (like Polyolester oils used in refrigeration), they are not typically used "in the making of" lubricants themselves. Lubricants are usually separate chemical entities (oils/greases) designed to work alongside HFCs, rather than being composed of them.
The distinction hinges on whether the HFC is a
constituent/process agent of the product or merely a
compatible fluid. For aerosols, foam, and fire suppressants, the HFC is an integral functional component of the final product or its manufacturing process. In the case of lubricants, HFCs are the substances
being lubricated in a system, rather than a raw material for the lubricant's production.