SSC Ecology And Environment Sample Paper NCERT Sample Paper-4

  • question_answer
    Pollutants can be classified as primary and secondary. Which of these is/are primary pollutant?
    1. Volatile Organic Compounds
    2. Ground Level Ozone
    3. Acid Rain
    Select the correct answer using the codes given below.

    A)  1 only

    B)  1 and 2 only

    C)  1 and 3 only

    D)  1, 2 and 3

    Correct Answer: A

    Solution :

    [a] A primary pollutant is an air pollutant emitted directly from a source. A secondary pollutant is not directly emitted as such, but forms when other pollutants (primary pollutants) react in the atmosphere. Ground Level Ozone is a "secondary" pollutant because it is produced when two primary pollutants react in sunlight and stagnant air. These two primary pollutants are nitrogen oxides \[(NOx)\] and volatile organic compounds (VOCs). Acid rain is a secondary pollutant.

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