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7th Class Science Water: A Precious Resource Question Bank Water : A Precious Resource

  • question_answer
    In the treatment of waste water, following steps are involved. (i) Aeration                  (ii) filtration (iii) Chlorination The correct order of these steps is

    A) (i), (iii), (ii)                  

    B) (iii), (ii), (i)

    C) (i), (ii), (iii)      

    D) (ii), (iii) (i)

    Correct Answer: C

    Solution :

    (i), (ii), (iii)      


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