Question

CFC are not recommended to be used in refrigerators because they
A.Increase temperature
B.Deplete ozone
C.Affect environment
D.Affect human body

Answer 1

CFC also known as Chlorofluorocarbon is a gas that is commonly used as a solvent, refrigerant and propellant by the industries. CFC is made up of Carbon, Chlorine and Fluorine atoms. CFCs have low toxicity, less reactivity and low flammability. However, scientists have recently discovered the harmful effects of CFCs to the environment. The chlorine molecule in the CFC has been found to cause the harmful effect.

Complete step by step answer:
Option A increase temperature: The elements that increase the temperature of the environment are called greenhouse gases. These gases trap the earths solar radiation in the atmosphere thereby increasing the temperature. Some of the greenhouse gases are $C{O_2}$, $C{H_4}$ and ${N_2}O$. CFC is not a greenhouse gas.
Option A is incorrect.
Option B deplete ozone: Ozone is an inorganic molecule made up of three oxygen atoms. It is found in the earths stratosphere and blocks harmful UV rays from the sun. Chlorofluorocarbons are the main cause of ozone layer depletion. The molecules of CFC in the stratosphere are broken down by the ultraviolet radiations which release chlorine atoms. The chlorine atoms interact with ozone and destroy it.
Option B is correct.
Option C affect environment: CFC affects the environment indirectly by depleting the ozone layer. Without the protection from ozone, harmful UV rays reaches the earth atmosphere and produce deteriorating effects to all living and non-living things. Since CFC affects the environment indirectly, this option is wrong.
Option C is incorrect.
Option D affects human body: CFC gas has found to be less toxic and less reactive to humans. It is one of the safest gas approved to be used in refrigerators. CFC doesn’t affect human body.
Option D is incorrect.

Option B Deplete ozone.

Note:
Some of the other ozone depleting substances include halons, carbon tetrachloride, methyl chloroform, hydrobromofluorocarbons, hydrochlorofluorocarbons, methyl bromide and bromochloromethane. Ozone is a protective layer that protects us from harmful UV radiations. Exposure to high UV radiation can cause skin cancers and skin epidermal damage.