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(D) Freons or chlorofluorocarbons $(CFCs)$ are responsible for the depletion of the ozone layer in the upper strata of the atmosphere.They are used as

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Freons

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(D) Freons or chlorofluorocarbons $(CFCs)$ are responsible for the depletion of the ozone layer in the upper strata of the atmosphere.They are used as propellants,aerosol spray caps,refrigerants,and fire-fighting reagents.They are stable and chemically inert compounds that absorb $UV$ radiation and break down,liberating free atomic chlorine.This chlorine atom causes the decomposition of ozone through a free radical reaction,resulting in the depletion of the ozone layer.Common freons include $Freon-11$ $(CFCl_3)$ and $Freon-12$ $(CF_2Cl_2)$.The reaction mechanism is as follows:$Cl^{\bullet} + O_3 \longrightarrow ClO^{\bullet} + O_2$$ClO^{\bullet} + O_3 \longrightarrow Cl^{\bullet} + 2O_2$

Which one of the following is responsible for depletion of the ozone layer in the upper strata of the atmosphere?

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