Question

(a) Explain the role of UV radiation in producing ozone layer.
(b) Mention the reaction involved.
(c)Why is excessive use of CFCs a cause of concern?​

Answer 1

Answer:

a)Ozone absorbs UV-B radiation from the sun. When an ozone molecule absorbs UV-B, it comes apart into an oxygen molecule (O2) and a separate oxygen atom (O). ... By absorbing UV-B in the stratosphere, the ozone layer prevents harmful levels of this radiation from reaching Earth's surface.

b)O2 + UV => O + O

2 O + 2 O2 + third molecule => 2 O3 + third molecule

Net Reaction: 3 O2 + UV => 2 O3

c)When CFCs reach upper layers of the atmosphere, they cause depletion of ozone layer and allow harmful UV radiations to reach the surface of the earth to create health hazards.

Answer 2

Answer:

Ozone absorbs UV-B radiation from the sun. When an ozone molecule absorbs UV-B, it comes apart into an oxygen molecule (O2) and a separate oxygen atom (O). ... By absorbing UV-B in the stratosphere, the ozone layer prevents harmful levels of this radiation from reaching Earth's surface.

As well as UV-B, the sun also emits another form of ultraviolet light, UV-C. ... UV-C splits oxygen molecules into oxygen atoms. These single atoms then react with other oxygen molecules to produce ozone. So, these reactions increase the amount of ozone in the stratosphere.

The excessive use of cfc's ( chlorofluorocarbons ) is a cause of concern because cfc's cause the depletion of Ozone layer by decomposing Ozone to oxygen

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