Chapter 20, Problem 7RAT

What role do CFCs play in the catalytic destruction of ozone?

(a) Ozone is destroyed upon binding to a CFC molecule that has been energized by ultraviolet light.

(b) There is no strong scientific evidence that CFCs play a significant role in the catalytic destruction of ozone.

(c) CFC molecules activate chlorine atoms into their catalytic action.

(d) CFC molecules migrate to the stratosphere where they generate chlorine atoms upon being destroyed by ultraviolet light.

To determine

The correct option for the statement “What role do CFCs play in the catalytic destruction of ozone?”.

Answer to Problem 7RAT

The correct option for the statement “What role do CFCs play in the catalytic destruction of ozone?” is option (d).

Explanation of Solution

The ozone molecule constituting three oxygen atoms are highly reactive in nature and can decompose with some radical species or atoms reaching the ozone layer.The Earth’s outer layers like the stratosphere are composed of ozone molecule that acts as the protective covering of the atmosphere.

The CFCs molecule reaching the stratospheric region is attacked by the highly energized protons of the ultraviolet rays. This will break the CFCs molecule and give out extremely reactive chlorine radicals.

These chlorine radicals from the CFCs are highly reactive and easily approach the ozone layer for the destruction process. These radical species act as a catalyst in the process of decomposition or destruction of atmospheric ozone.

Conclusion:

Therefore, the correct option is option (d).