Question

Which of the following is/are both greenhouse gas(es) and ozone depleting substance(s)?

• A. CFC-11
• B. CO2
• C. HCFC-22
• D. N2O

Hint:

CFCs like CFC-11 are both potent greenhouse gases and harmful to the ozone layer. They are being phased out due to their environmental impact.

Answer 1

The Correct Option is A

CFC-11 (Chlorofluorocarbon-11) is both a greenhouse gas and an ozone-depleting substance. It contributes to global warming by trapping heat in the atmosphere and harms the ozone layer by breaking down ozone molecules. Step 1: Greenhouse Gas Effect
CFC-11 is a greenhouse gas because it has a high global warming potential and traps heat in the atmosphere. Step 2: Ozone Depletion
CFC-11 is also an ozone-depleting substance because when it is released into the atmosphere, it breaks down ozone molecules, leading to the thinning of the ozone layer. Final Answer: \[ \boxed{\text{(A) CFC-11}} \]