7th Class Science Wastewater Story Question Bank Wastewater Story

  • question_answer In the treatment of waste water, following steps are involved. (i) aeration                   (ii) nitration (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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