Consider the following: 1. Aerosols 2. Foam agent

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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?

[UPSC PRELIMS GS 1 2023]

Only one

Only two

Only three

All four

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