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Biochemical oxygen demand (BOD) of a water sample is the:

  1. Aamount of oxygen dissolved in one litre of the sample at 20 C
  2. Bmass of dichromate consumed by the sample in acid solution
  3. Camount of oxygen released by algae in the sample on exposure to sunlight
  4. Damount of oxygen required by bacteria to break down the organic matter present in a given volume of the sample

Answer: D

BOD measures the oxygen used by microorganisms for the oxidation of biodegradable organic matter. It is expressed in mg of oxygen per litre (ppm).
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