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(A) $CFCs$ (Chlorofluorocarbons) are primarily responsible for ozone layer depletion.$CFCs$ are used as refrigerants in refrigerators and air conditio

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Ozone layer depletion

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(A) $CFCs$ (Chlorofluorocarbons) are primarily responsible for ozone layer depletion.$CFCs$ are used as refrigerants in refrigerators and air conditioners,and as propellants in aerosol sprays. When these $CFCs$ reach the stratosphere,$UV$ rays break down the $CFC$ molecules,releasing chlorine $(Cl)$ atoms (free radicals).These chlorine free radicals react with ozone $(O_3)$ to convert it into oxygen $(O_2)$,thereby reducing the ozone content in the atmosphere. The reaction is as follows:$Cl + O_3 \rightarrow ClO + O_2$$ClO + O \rightarrow Cl + O_2$One chlorine free radical is sufficient to destroy a large number of ozone molecules because the chlorine radical is regenerated in the process,allowing it to continue the cycle of ozone destruction.

$CFCs$ are responsible for:

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