• # question_answer 31)   Which of the following statements is correct? (a) Ozone hole is a hole formed in stratosphere from which ozone oozes out. (b) Ozone hole is a hole formed in the troposphere from which ozone oozes out. (c) Ozone hole is thinning of ozone layer of stratosphere at some places. (d) Ozone hole means vanishing of ozone layer around the earth completely.

(c) Two types of compounds have been found to be the most responsible for depleting the ozone layer. These are : (i) NO and (ii) chlorofluorocarbons. $NO+{{O}_{3}}\xrightarrow{{}}N{{O}_{2}}+{{O}_{2}}$ $C{{F}_{2}}C{{l}_{2}}\xrightarrow{hv}{{\,}^{\centerdot }}C{{F}_{2}}Cl+{{\,}^{\centerdot }}Cl$ ${{\,}^{\centerdot }}Cl+{{O}_{3}}\xrightarrow{{}}Cl{{O}^{\centerdot }}+{{O}_{2}}$ $Cl{{O}^{\centerdot }}+O\xrightarrow{{}}C{{l}^{\centerdot }}+{{O}_{2}}$ These reactions occur in stratosphere.

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