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?
A
Only one
B
Only two
C
Only three
Correct answer
D
All four
Explanation
Three of the four. Hydrofluorocarbons were introduced to replace the ozone-depleting CFCs and HCFCs. They are used as propellants in aerosol cans, as blowing agents in making foams, and as fire-extinguishing agents (HFC-227ea, for example, in fire-suppression systems), besides their main use as refrigerants in air conditioners and refrigerators. They are not used in making lubricants. HFCs do not harm the ozone layer, but many are powerful greenhouse gases, which is why the Kigali Amendment (2016) to the Montreal Protocol phases them down.
Environmental PollutionHydrofluorocarbons (HFCs) ApplicationsHydrofluorocarbons (HFCs)AerosolsFoam agentsFire retardantsLubricantsgreenhouse gases