Assertion :Chlorofluorocarbons deplete ozone Reason: Chlorofluorocarbon contain chlorine,bromine and fluorine

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Ozone has always had natural enemies in the atmosphere. CFCs, combined with ozone molecules, cause the ozone depletion. CFCs, composed by chlorine, fluorine, and carbon, have a long lifecycle, which favours their accumulation. They break up only through sunlight, which divides their molecules, causing the release of chlorine (Cl). Once the chlorine is released, it is able to react with ozone (O3), to form chlorine monoxide (ClO) and oxygen (O2).
When the molecule of chlorine monoxide (ClO) meets another molecule of oxygen (O) it breaks up, releasing chlorine (Cl), which can “destroy” another molecule of ozone (O3), creating the catalytic cycle of chlorine.
So the answer is 'Both Assertion and Reason are correct and Reason is the correct explanation for Assertion'.

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