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  5. Environmental Chemistry / पर्यावरणीय रसायन

11th Class Chemistry Environmental Chemistry / पर्यावरणीय रसायन

  • question_answer 65)
      Assertion (A): If BOD level of water in a reservoir is less than 5 ppm, it is highly polluted. Reason (R): High biological oxygen demand means low activity of bacteria in water.

    Answer:

      (c) High BOD means high activity of bacteria in water.


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