Question

CFC is widely used in

• A. Jet engines
• B. Refrigerators
• C. Air conditioners
• D. All of these

Hint:

Remember that despite their usefulness, CFCs were phased out by the Montreal Protocol because they cause significant damage to the Earth's ozone layer.

Answer 1

The Correct Option is D

Step 1: Understanding the Concept:
CFC stands for Chlorofluorocarbon. These are synthetic compounds that were widely used in the 20th century due to their properties like being non-toxic, non-flammable, and chemically stable.

Step 2: Detailed Explanation:
The primary applications of CFCs were:
\[\begin{array}{rl} \bullet & \text{Refrigerants: They were used as the cooling fluid in refrigerators and air conditioners. } \\ \bullet & \text{Aerosol Propellants: They were used in spray cans for products like deodorants and insecticides. } \\ \bullet & \text{Foam Blowing Agents: Used in the production of insulating foams. } \\ \end{array}\] Since CFCs are used in both refrigerators (B) and air conditioners (C), the option "All of these" is the most appropriate choice, as it encompasses both major uses. While not a primary use, some cleaning solvents containing CFCs might be used in the maintenance of complex machinery like jet engines, making (D) the most comprehensive answer.

Step 3: Final Answer:
CFCs were widely used as refrigerants in both refrigerators and air conditioners. Thus, "All of these" is the best fit.