UPSC CSE Prelims
Question 63
Consider the following statements:
Chlorofluorocarbons, known as ozone-depleting substances, are used
- in the production of plastic foams
- in the production of tubeless tyres
- in cleaning certain electronic components
- as pressurizing agents in aerosol cans
Which of the statements given above is/are correct?
View correct answer and explanation
Correct answer: C
Correct Option: C
Explanation: CFCs historically served as foam-blowing agents, electronics-cleaning solvents and aerosol propellants.
Statement/Item-wise Analysis:
1: Correct - CFCs were used to expand certain polymer foams.
2: Incorrect - Tubeless-tyre production is not a standard CFC application in this list.
3: Correct - Some CFCs were used as precision-cleaning solvents in electronics.
4: Correct - CFCs once served as aerosol propellants before restrictions.
Option-wise Analysis:
A: Incorrect - includes incorrect item 2; omits correct item 4.
B: Incorrect - omits correct items 1, 3.
C: Correct - includes exactly the valid statements/items and excludes the invalid ones.
D: Incorrect - includes incorrect item 2.