Question

Ozone in the stratosphere is depleted by
A. $C_6F_6C_16$
B. $C_7F_16$
C. $CF_2C_12$
D. $C_6F_6$

Answer 1

Hint:
The second major layer of the atmosphere is the stratosphere, and the lowest layer lies above the troposphere. It dominates the atmospheric area about 12 to 50 km above the surface of the Earth, while its lower limit appears to be higher near the equator and lower near the poles.

An inorganic molecule with the chemical formula $O _3$ is ozone or trioxygen. It is a pale blue gas with an odour that is strongly pungent. That is an oxygen allotrope that is much less stable than the $O_2$ diatomic allotrope, which breaks down to $O_ 2$ in the lower atmosphere.

Complete answer:
For humans, ozone is both helpful and negative. As a consequence of chemical reactions involving traffic emissions and sunlight, ozone formation near the ground can cause a variety of respiratory problems, particularly for young children. However, way up in the atmosphere in an area known as the stratosphere, in the cell-damaging ultraviolet (UV) portion of the spectrum, ozone blocks out incoming radiation from the Sun. Life on earth would not have evolved in the manner it has without this ozone layer. Ozone loss occurs as chlorofluorocarbons (CFCs) and halons are emitted into the atmosphere as gases formerly used in aerosol spray cans and refrigerants. Chemical reactions that break down ozone molecules are caused by CFCs and halons, reducing the ultraviolet radiation absorption ability of ozone. Thus, Ozone in the stratosphere is depleted by $CF_2C_12$.

Therefore, the correct answer is C

Note:
The stratospheric ozone blocks most of the Sun's ultraviolet radiation. Without ozone, the intensive UV radiation of the Sun will sterilize the atmosphere of the Earth. All the most energetic, UV-c radiation and most of the UV-b radiation are screened by ozone.

The "ozone layer" is widely regarded as the stratospheric region with the highest ozone concentration. Scientists have disclosed that the void found last month in the ozone layer above the Arctic has repaired itself.

At 24.8 million square kilometres (9.6 million square miles), the yearly ozone hole reached its peak area on September 20, 2020, about three times the size of the continental United States. NASA and NOAA track the ozone hole by complementary experimental approaches.