UPSC CSE Prelims 2012 Q17 — Environment & Ecology PYQ with Answer

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?