Question

Assertion (A): Ozone is formed in upper atmosphere by O, in presence of UV radiations.

Reason (R): Ozone depletion will lead to UV radiation.

Options

• Both A and R are true and R is the correct explanation of A.

• Both A and R are true but R is not the correct explanation of A.

• A is true but R is false.

• A is false but R is true.

Answer 1

Both A and R are true but R is not the correct explanation of A.

Explanation:

Ozone is formed in the upper atmosphere when ultraviolet (UV) radiation breaks oxygen molecules (O₂) into oxygen atoms (O). These oxygen atoms then combine with oxygen molecules to form ozone (O₃). Therefore, the Assertion (A) is true.

Depletion of the ozone layer allows more harmful UV radiation from the Sun to reach the Earth’s surface. Therefore, the Reason (R) is also true.

However, the Reason explains the effect of ozone depletion, not the formation of ozone in the upper atmosphere.

Hence, both A and R are true, but R is not the correct explanation of A.