Question

116. In stratosphere, which one of the following
elements acts as a catalyst in degradation of
ozone and release of molecular oxygen?
(a) Fe
(b) CI
(c) Carbon
(d) Oxygen​

Answer 1

Answer:

option:b

Explanation:

As we learnt in

Degradation of ozone layers -

There should be a balance between production and degradation of ozone in the stratosphere. Of late, the balance has been disrupted due to enhancement of ozone degradation by chlorofluorocarbons (CFCs).

where in CFCs find wide use as refrigerants. CFCs discharged in the lower part of atmosphere move upward and reach stratosphere. In stratosphere, UV rays act on them releasing Cl atoms. Cl degrades ozone releasing molecular oxygen, with these atoms acting merely as catalysts; Cl atoms are not consumed in the reaction. Hence, whatever CFCs are added to the stratosphere, they have permanent and continuing affects on Ozone levels.

UV rays act on CFCs, releasing Cl atoms, chlorine reacts with converting into oxygen.

Option 2)

Cl

This is correct.