Question

Ozone in the stratosphere is depleted by -
A. C6F6 Cl6
B. C7F16
C. CF2Cl2
D. C6F6

Answer 1

Hint:In refrigerators, coolers and so on, the chemical has been used as coolants.
The CFCs allow the ozone molecule that forms the oxygen radical and O2 to split apart. The loss of the ozone layer results in the penetration into the Earth's atmosphere of toxic UV radiation from the sun.

Complete answer:
Ozone Layer -
An area of the Earth's stratosphere that absorbs much of the ultraviolet radiation from the Sun is the ozone layer or ozone shield. It contains a high ozone concentration compared to other areas of the atmosphere, but it is still low in comparison to other stratospheric gases.
Option A. C6F6 Cl6
Stratospheric ozone is not destroyed by C6F6 Cl6. Hence, this option is incorrect.
Option B. C7F16
In the stratosphere, ozone is not destroyed by C7F16. Hence, this option is incorrect.
Option C. CF2Cl2
Ozone depletion -
Ozone loss, a progressive thinning of the Earth's upper atmospheric ozone layer caused by the release from manufacturing and other human activities of chemical compounds containing gaseous chlorine or bromine. In the polar regions, particularly above Antarctica, the thinning is most pronounced.
Causes of Ozone depletion -
Manufactured chemicals, especially manufactured halocarbon refrigerants, solvents, propellants, and foam-blowing agents (chlorofluorocarbons (CFCs), HCFCs, halons), are the main cause of ozone depletion and the ozone hole. Scientists have observed a drop in stratospheric ozone since the early 1970s and it has been found to be more pronounced in the Polar Regions.
The two key gases that are responsible for this ozone layer depletion are carbon monoxide and CFC.
Carbon monoxide is produced from incomplete fuel combustion.
Throughout the stratosphere, ozone is depleted by CF2Cl2. Hence, this option is correct.
Option D. C6F6
In the stratosphere, ozone will not be depleted by C6F6. Hence, this option is incorrect.
Therefore, In the atmosphere, the presence of CFCs results in the loss of the ozone layer. This substance's chemical formula is CF2Cl2.

Hence, Option C. CF2Cl2 is the correct answer.

Note:On September 16, World Ozone Day is observed every year to raise awareness among individuals about the loss of the ozone layer. The motto for World Ozone Day is 'Ozone For Life' this year.
Ozone layer degradation has adverse effects on human health, wildlife, the climate, and marine life. Studies indicate that an increase in UV-B rays causes a higher risk of skin cancer and plays a major role in the growth of malignant melanoma, sunburn, accelerated aging, eye cataracts, blindness and the immune system at weekends.