Question 81 from UPSC CSE 2023 - Environme nt

Question

Consider the following:
1. Aerosols
2. Foam agents
3. Fire retardants
4. Lubricants
In the making of how many of the above are hydrofluorocarbons used?

IASCODEX · Accepted Answer

Correct Option: D. All four

Strategy: To determine the industrial uses of HFCs:
*   Identify broad categories of HFC application, such as coolants, propellants, and fire suppressants.
*   Recall specific examples including aerosols and foam agents, noting their role in replacing CFCs.
*   Consider their use in fire suppression systems and as derivatives in lubricants compatible with HFC-based refrigerants.
*   Confirm that each listed item aligns with established HFC applications.

Key Info: Hydrofluorocarbons (HFCs) are synthetic organic compounds made up of hydrogen, fluorine, and carbon atoms. They are produced mainly as replacements for ozone-depleting chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs) following the Montreal Protocol. HFCs do not contain chlorine, so they do not harm the stratospheric ozone layer. However, they are potent greenhouse gases with very high global warming potential (GWP).

*   **Aerosols**: HFCs are used as propellant gases in medical inhalers, household products, and cosmetic sprays, because they are non-flammable and non-ozone depleting.
*   **Foam agents**: HFCs act as blowing agents in manufacturing insulating foams for refrigeration, building insulation, and packaging materials, replacing CFCs and HCFCs.
*   **Fire retardants**: Certain HFCs (such as HFC-227ea and HFC-236fa) are used in clean agent fire suppression systems, especially where water damage must be avoided, such as in computer rooms and archives.
*   **Lubricants**: Synthetic lubricants compatible with HFC-based refrigeration and air conditioning systems are formulated using HFCs, as mineral oils are often not miscible with these refrigerants.

### International Regulation
The Kigali Amendment to the Montreal Protocol (in force since 2019) mandates a gradual reduction of HFC production and consumption because of their global warming effect. Though HFCs make up a small percentage of total greenhouse gases, their high GWP makes their management critical for climate change mitigation.

IASCODEX · Answer

Option A: Only one

IASCODEX · Answer

Option B: Only two

IASCODEX · Answer

Option C: Only three

Consider the following: Aerosols Foam agents Fire retardants Lubricants In the making of how many of the above are hydrofluorocarbons used?

Consider the following:

Aerosols

Foam agents

Fire retardants

Lubricants

In the making of how many of the above are hydrofluorocarbons used?