Consider the following statements: Chlorofluorocarbons, known as ozone-depleting substances, are used 1. in the production of plastic foams 2. in the production of tubeless tyres 3. in cleaning certain electronic components 4. as pressurizing agents in aerosol cans Which of the statements given above is/are correct?
- A1, 2 and 3 only
- B4 only
- C1, 3 and 4 onlyCorrect
- D1, 2, 3 and 4
Explanation
The correct answer is C because of the following reasons:
Statement 1 is correct: Chlorofluorocarbons or CFCs are commonly used as blowing agents in the manufacture of plastic foams, such as polyurethane and polystyrene, to create the cellular structure.
Statement 2 is incorrect: CFCs are not used in the production of tubeless tyres. The manufacturing process for rubber tyres involves vulcanization and synthetic rubber processing, which do not require ozone depleting substances.
Statement 3 is correct: CFCs, particularly CFC 113, were widely used as solvents to clean delicate electronic components and circuit boards because they evaporate quickly and do not damage the parts.
Statement 4 is correct: CFCs were traditionally used as propellants or pressurizing agents in aerosol spray cans for products like hairsprays, deodorants, and insecticides before being phased out due to environmental regulations.
Since statements 1, 3, and 4 are true, option C is the correct choice.
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