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    Question

    Ozone concentration in the atmosphere is reduced

    by
    A CO_2 and O_2 Correct Answer Incorrect Answer
    B H_2S and CH_4 Correct Answer Incorrect Answer
    C CFC and Cl_2 Correct Answer Incorrect Answer
    D N_2 and N_2 0 Correct Answer Incorrect Answer

    Solution

    The primary cause of ozone depletion is the presence of chlorine-containing source gases (primarily CFCs and related halocarbons). In the presence of UV light, these gases dissociate, releasing chlorine atoms, which then go on to catalyze ozone destruction.

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