Question

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How is ozone formed in the upper atmosphere ? State its importance.
What is responsible for its depletion ? Write one harmful effect of ozone
depletion.​

Answer 1

Explanation:

This allotropic form of oxygen is formed by passing dry oxygen through a salient electric current. By doing so a part of the oxygen molecules undergo dissociation and then atomic oxygen gets associated with the oxygen molecule to give 5%-10% of the allotropic form of oxygen. The product obtained is called as ozonized oxygen.

O2 −→−−−energy O+O

O2+O → O3

3O2↔2O3 – energy (endothermic reaction)

Ozone is unstable and decomposes to molecular oxygen. A dynamic equilibrium is maintained between the formation and decomposition of ozone. It has been found that this protective ozone layer is getting depleted because of the presence of CFC (chlorofluorocarbon) compounds.

When CFC is released into the atmosphere, they mix with atmospheric gases and reach the stratosphere. In presence of ultraviolet rays, they are broken down to form chlorine radicals. This chlorine radical reacts with ozone to form chlorine monoxide and oxygen molecule.

CF2Cl2 (g) −→−−−uv Cl (g) + CF2Cl (g) (Note: Cl is in the form of radical)

(Note: Cl is in the form of radical)

Cl (g) + O3 (g) → ClO (g) + O2 (g)

This reaction breaks down the ozone. CFC compounds are agents which release chlorine radical in the atmosphere and cause damage to the ozone layer.

Answer 2

ozone is produced naturally in stratosphere when highly energetic solar radiation strike molecules of oxygen. And causes the 2 oxygen atoms to split apart in a process called photolysis..

➡️ozone layer helps in protecting us from sun uv rays.

➡️ CFCs chlorofluorocarbons are responsible for depletion of ozone

➡️skin cancer is harmful effect of ozone depletion.

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