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Question
Which of the following statements is correct?
Options
Ozone hole is a hole formed in stratosphere from which ozone oozes out.
Ozone hole is a hole formed in the troposphere from which ozone oozes out.
Ozone hole is thinning of ozone layer of stratosphere at some places.
Ozone hole means vanishing of ozone layer around the earth completely.
Solution
Ozone hole is thinning of ozone layer of stratosphere at some places.
Explanation:
Since it was found that a unique set of conditions were responsible for the ozone hole. In summer, nitrogen dioxide and methane react with chlorine monoxide and chlorine atoms forming chlorine sinks, preventing much ozone depletion, whereas in winter, special types of clouds called polar stratospheric clouds are formed over Antarctica.
Following reactions occur in the stratosphere.
\[\ce{CH2Cl2 -> CF2Cl + \overset{\bullet}{C}l}\]
\[\ce{\overset{\bullet}{C}l + O3 -> Cl\overset{\bullet}{O} + O2}\]
\[\ce{Cl\overset{\bullet}{O} + [O] -> \overset{\bullet}{C}l + O2}\]
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RELATED QUESTIONS
The gaseous envelope around the earth is known as atmosphere. The region lying between an altitudes of 11 – 50 km is _______.
Which is considered to be the earth’s protective umbrella? Why?
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On the basis of chemical reactions involved, explain how do chlorofluorocarbons cause thinning of ozone layer in stratosphere.
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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:
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