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    Question

    Which of the following pollutants is the major

    contributor to photochemical smog?
    A Hydroperoxides Correct Answer Incorrect Answer
    B Ozone Correct Answer Incorrect Answer
    C Nitrogen dioxide Correct Answer Incorrect Answer
    D Peroxynitrates Correct Answer Incorrect Answer

    Solution

    Ozone : • Ozone is an allotrope of Oxygen, with molecular formula 03. • It is stabilised by resonance i.e. delocalisation of electrons. • It is a pale blue coloured gas present in our the stratosphere layer. • It protects us from the harmful Ultraviolet Rays coming from the sun. • The chlorofluorocarbons (CFCs) are the ozone-depleting agents originating from Air Conditioners, Refrigerators and Aerosols. • Montreal Protocol was signed on September 16, 1987, for the protection of Ozone, that entered into force on January 1, 1989. • But when Ozone is present at ground level, instead of atmosphere it acts as a pollutant.

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