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  3. 7th Class
  4. Science

7th Class Science Sample Paper Science Sample Paper - 7

  • question_answer
    What are the different types of inorganic and organic impurities generally present in sewage?

    Answer:

    (i) Inorganic impurities: Nitrates, phosphates and metals.
    (ii) Organic impurities: Fruit and vegetable wastes, oil, urea, human faeces, animal waste, pesticides and herbicides.         


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