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When healthy earth's stratosphere contains a low concentration of zone $$(O_{3})$$ that absorbs potentially harmful ultraviolet (UV) radiations by the cycle shown below:
Chloropfluro carbon refrigerants , such as freon $$12 (CF_{2}CL_{2})$$ are stable in lower atmosphere , but in the stratosphere , they absorb high UV radiations to generate chlorine radicals .
$$CF_{2}CL_{2}\overset{hv}{\rightarrow}CF_{2} Cl+Cl_{2}$$
The presence of small number of chlorine radicals appears to lower ozone concentrations dramatically. The following reactions are all known to be exothermic (except the one requiring light ) and to have high rate constant
$$Cl - O - Cl \overset{hv}{\rightarrow} O_{2} + 2Cl$$
$$Cl - O + O \rightarrow O_{2} + cL$$
$$Cl + O_{3} \rightarrow Cl - O + O _{2} $$
$$2Cl - O \rightarrow Cl - O - O - Cl$$
Increase UV radiations due to hole in ozone layer :

A
will cause increase in case of skin diseases
B
will cause summer to be more warmer
C
will cause more ice to melt
D
will cause more rain
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Correct option is A. will cause increase in case of skin diseases

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Similar Questions
Q1
When healthy earth's stratosphere contains a low concentration of zone $$(O_{3})$$ that absorbs potentially harmful ultraviolet (UV) radiations by the cycle shown below:
Chloropfluro carbon refrigerants , such as freon $$12 (CF_{2}CL_{2})$$ are stable in lower atmosphere , but in the stratosphere , they absorb high UV radiations to generate chlorine radicals .
$$CF_{2}CL_{2}\overset{hv}{\rightarrow}CF_{2} Cl+Cl_{2}$$
The presence of small number of chlorine radicals appears to lower ozone concentrations dramatically. The following reactions are all known to be exothermic (except the one requiring light ) and to have high rate constant
$$Cl - O - Cl \overset{hv}{\rightarrow} O_{2} + 2Cl$$
$$Cl - O + O \rightarrow O_{2} + cL$$
$$Cl + O_{3} \rightarrow Cl - O + O _{2} $$
$$2Cl - O \rightarrow Cl - O - O - Cl$$
Ozone has the ability to absorb:

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Q2
Chlorine atoms in the upper atmosphere cause the breakdown of ozone.
$$Cl+O_3\rightarrow O_2+ClO$$
$$ClO+O\rightarrow Cl+O_2$$
Which statements are correct when referring to these chlorine atoms?
$$1$$. The chlorine atoms act as catalysts.
$$2$$. The chlorine atoms are free radicals.
$$3$$. The chlorine atoms are formed by heterolytic fission of a covalent bond in chlorofluorocarbons.
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Q3
Assertion :In free-radical chlorination reaction using UV−light,UV-light is required only for initiation reaction as Cl−Cl+UV→2Cl∗ Initiation Although free radicals are not consumed in overall propagation step and therefore, it appears that the reaction would continue to occur even in absence of UV source once initiated, continuous UV-bathing is required. Reason: Free radicals are consumed in termination step, therefore needs to be produced continuously.
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Q4
Assertion :UV radiation cause photo dissociation of ozone into O2 and O thus causing damage to stratospheric ozone layer. Reason: Ozone hole is resulting in global warming and climatic change.
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Q5
For the following reaction, which species is acting as a catalyst? Which is an intermediate? Overall: $$O_3 + O \rightarrow 2 O_2$$
Step 1: $$Cl + O_3 \rightarrow ClO + O_2$$
Step 2:$$ ClO + O \rightarrow Cl + O_2$$
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