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प्रश्न
On the basis of chemical reactions involved, explain how do CFC’s cause depletion of ozone layer in stratosphere?
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उत्तर
In the presence of uv radiation, CFC’s break up into chlorine free radical.
\[\ce{CF2Cl ->[hv] CF2Cl + Cl}\]
\[\ce{CFCl3 ->[hv] CFCl2 + Cl}\]
\[\ce{Cl + O3 → ClO + O2}\]
\[\ce{ClO + O → Cl + O2}\]
Chlorine radical is regenerated in the course of reaction. Due to this continuous attack of Cl thinning of Ozone layer takes place which leads to formation of the ozone hole.
It is estimated that for every reactive chlorine atom generated in the stratosphere 1,00,000 molecules of ozone are depleted.
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संबंधित प्रश्न
The gaseous envelope around the earth is known as atmosphere. The region lying between an altitudes of 11 – 50 km is _______.
Ozone depletion will cause ______.
Which is considered to be the earth’s protective umbrella? Why?
What do you mean by ozone hole?
Which of the following statements is wrong?
Ozone is a toxic gas and is a strong oxidising agent even then its presence in the stratosphere is very important. Explain what would happen if ozone from this region is completely removed?
On the basis of chemical reactions involved, explain how do chlorofluorocarbons cause thinning of ozone layer in stratosphere.
Ozone is a gas heavier than air. Why does ozone layer not settle down near the earth?
Assertion (A): Ozone is destroyed by solar radiation in upper stratosphere.
Reason (R): Thinning of the ozone layer allows excessive UV radiations to reach the surface of earth.
The statement that is not true about ozone is:
