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?

Correct Option: Only three

Hydrofluorocarbons (HFCs) are synthetic fluorinated compounds widely developed and used as replacements for ozone-depleting substances like CFCs and HCFCs. They are extensively utilized in aerosols (as propellants), foam blowing agents (in manufacturing insulation and packaging foams), and refrigeration/air-conditioning equipment. However, they are generally not used as fire retardants or lubricants in standard applications. Thus, HFCs are used in three of the above.