Question

Assertion (A): Ozone is destroyed by CFCs in the upper stratosphere.

Reason (R): Ozone holes increase the amount of UV radiation reaching the earth.

Options

• Assertion and reason are incorrect.

• Assertion and reason are both correct, and the reason is the correct explanation for the assertion.

• Assertion and reason are correct but, the reason is not the explanation for the assertion. 

• Assertion is false, but the reason is correct.

Answer 1

Assertion and reason are correct but, the reason is not the explanation for the assertion.

Explanation:

Ozone layer is depleted due to release of throw carbons (CFCs)

\[\ce{CF2Cl(g) ->[UV] Cl(g) + F2 C\overset{*}{l} (g)}\]

\[\ce{C\overset{*}{l} + O3 -> Cl\overset{*}{O}(g) + O2(g)}\]

\[\ce{Cl\overset{*}{O} + O(g) -> C\overset{*}{l} + O2}\]

The amount of UV radiation reaching the planet has increased as a result of ozone layer loss. This both statements are correct but reason in not the correct explanation of the assertion.