Question

Assertion (A): Ozone (O₃) gas at higher levels of atmosphere is a product of UV radiation acting on Oxygen (O₂).

Reason (R): The amount of ozone in the atmosphere began to droр sharply in 1980s.

Options

• Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).

• Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A).

• Assertion (A) is true, but Reason (R) is false.

• Assertion (A) is false, but Reason (R) is true.

Answer 1

Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A).

Explanation:

Ozone in the upper atmosphere is formed when UV radiation splits oxygen (O₂) molecules, and the free oxygen atoms combine with O₂ to form O₃. The decrease in ozone levels during the 1980s was mainly due to CFCs, which are not the reason for its formation.