Which of the following statements is correct?
(i) Ozone hole is a hole formed in stratosphere from which ozone oozes out.
(ii) Ozone hole is a hole formed in the troposphere from which ozone oozes out.
(iii) Ozone hole is thinning of ozone layer of stratosphere at some places.
(iv) Ozone hole means vanishing of ozone layer around the earth completely.

Answers (1)

The answer is the option (iii) Ozone hole is thinning of the ozone layer of the stratosphere at some places.

Explanation: There are some unique situations according to the season which is responsible for the zone hole.

In Summer:NO_{2} and CH_{4} react with Chlorine monoxide and chlorine atoms forming chlorine sinks. It prevents much of the ozone depletion.

In Winter: Polar stratospheric clouds are formed over Antarctic. The following reaction occurs there:

NO+O_{3}\rightarrow NO_{2}+O_{2}

CF_{2}Cl_{2}\overset{h\nu }{\rightarrow}\dot{C}F_{2}Cl+\dot{C}l

\dot{C}l+O_{3}\rightarrow Cl\dot{O}+O_{2}

Cl\dot{O}+O\rightarrow \dot{Cl}+O_{2}

These reactions occur in the stratosphere.

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