Which of the following statements is true?A CFCs and nitrogen monoxide, NO, are involved in the depletion of the ozonelayer.B CFCs act as catalysts for the depletion of the ozone layer, while nitrogenmonoxide, NO, does not.C CFCs and ozone are free radicals.D CFCs and nitrogen monoxide, NO, are decomposed by UV radiation.

The correct statement is: A. CFCs and nitrogen monoxide, NO, are involved in the depletion of the ozone layer.

Here's why:

A. CFCs (Chlorofluorocarbons) and nitrogen monoxide (NO) are indeed involved in the depletion of the ozone layer. CFCs release chlorine atoms upon exposure to UV radiation, and these chlorine atoms act as catalysts in the destruction of ozone. Nitrogen monoxide also plays a role in ozone depletion.

B. This statement is false because both CFCs and nitrogen monoxide are involved in the depletion of the ozone layer.

C. This statement is false because CFCs and ozone are not free radicals. A free radical is a molecule that has an unpaired electron and is highly reactive. While chlorine atoms (produced from CFCs) and nitrogen monoxide are free radicals, CFCs and ozone themselves are not.

D. This statement is partially true. CFCs are indeed decomposed by UV radiation, which releases chlorine atoms that can deplete the ozone layer. However, nitrogen monoxide is not decomposed by UV radiation. Instead, it reacts directly with ozone.