UPSC Prelims 2023 – Question 20

Q 20. 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 
(d) All four 

Correct Answer: Option (c) 

• Hydrofluorocarbons (HFCs) are a group of industrial chemicals primarily used for cooling and refrigeration. HFCs are entirely man-made. They are primarily produced for use in refrigeration, air-conditioning, insulating foams, and aerosol propellants, with minor uses as solvents and for fire protection. Hence, option (c) is correct. 

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