Ozone in stratosphere is depleted by:

(AIIMS 2004)

C_{6} H_{6} C_{l 6}

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C F_{2} C l_{2}

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C_{7} F_{16}

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C_{6} F_{6}

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Solution

The correct option is B $C F_{2} C l_{2}$
Chlorofluorocarbons (CFCs or freons like $C F_{2} C l_{2}$ ) are responsible for depletion of the ozone layer in the upper strata of atmosphere. They are stable and inert compounds. They absorb UV rays and break down liberating free atomic chlorine which causes depletion of ozone through free radical reaction.
$∙ C l + O_{3} \to ∙ C l O + O_{2} ∙ C l O + O_{3} \to ∙ C l + 2 O_{2}$ .

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Ozone in stratosphere is depleted by

a) C₆F₆Cl₆ b) C₇F₁₆ c) CF₂ Cl₂ d) C₆F₆

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