BCECE Medical BCECE Medical Solved Papers-2008

  • question_answer
    \[{{O}_{3}}\] depletion is due to

    A)  PAN          

    B)  \[N{{O}_{x}}\]

    C)  CFCs         

    D)  sulphates

    Correct Answer: C

    Solution :

    The ozone layer present in the stratosphere protects earth from the harmful effects of ultraviolet rays. Presently, ozone layer is being depleted due to pollution. The main cause of ozone layer depletion is chlorofluorocarbons (CFCs) released from aerosol spray cans, polyurethane foams, air conditioners and refrigerators. One molecule of CFC can damage about 100000 molecules of ozone. Oxides of nitrogen and sulphur are the cause of acid rain. PAN is secondary pollutant found in photochemical smog.


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