Question

In the stratosphere, which of the following elements acts as a catalyst in the degradation of ozone and release of molecular oxygen.
A.Iron
B.Carbon
C.Oxygen
D.Chlorine

Answer 1

Hint:We know that solar rays contain several radiations that are harmful to our body. Most of them are reflected and do not reach the earth’s surface. The ozone layer present in our atmosphere has a major role in protecting us from these harmful radiations.

Complete answer:
The ozone layer is seen in the upper part of the atmosphere called the stratosphere. The layer of atmosphere enveloped by ozone is commonly called the ozone layer or ozone umbrella. It plays a vital role in protecting organisms from harmful UV radiation.
The ultraviolet radiation that is harmful to us is completely absorbed by the ozone layer. But the ozone layer is getting destroyed these days and that may result in serious health hazards. Ozone gas is formed by the action of ultraviolet rays on molecular oxygen present in the atmosphere. Meanwhile, its destruction also occurs simultaneously. The balance between the production and destruction of ozone is important for its efficiency to act as an insulator against these harmful radiations.
Chlorofluorocarbons are chemical substances that are emitted to the atmosphere by us that depletes the ozone layer. They are released from types of equipment used by us like air conditioners and refrigerators. These gases contain chlorine and by entering into a chain reaction, they are capable of destroying the ozone layer.
Hence the correct option is D.

Note:Keep in mind that other than good ozone that protects us from harmful radiations, bad ozone is also present. It is found in the troposphere and is harmful to plants and animals.
Ultraviolet rays emitted from the sun are capable of breaking chemical bonds of proteins and DNA. In this manner, they can even cause cancer by causing mutations.