Question

Consider the following statement.

A: Our earth is protected by the Ozone layer by UV rays coming from the Sun. 

B: In the process of protection of the earth by UV rays, a chemical change is involved. 

1. A and B both are correct
2. A is correct, B is incorrect
3. A is incorrect, B is correct
4. A and B, Both are incorrect

Answer 1

Correct Answer - Option 1 : A and B both are correct

Explanation:

• The ozone layer is present in our atmosphere to protect us from UV rays falling on the earth's surface. 
• The ozone absorbs this radiation. 
• The UV rays break the ozone into oxygen molecules. 
• If this process will not happen, the UV rays directly reaching on earth will be very dangerous for mankind. 
• So, the process involves a chemical change of conversion of ozone into oxygen, in the presence of UV rays. 

\(O_3 \overset{UV}{\rightarrow} O_2 \ + O\)

Therefore, A and B both are correct.

• The UV rays are Ultraviolet rays, the rays having frequencies higher than violet and not visible to us. 
• The Ozone layer is present in the stratosphere.