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Following the standard NCERT treatment, clean water has a BOD value:

  1. Abetween 10 and 15 ppm
  2. Bless than 5 ppm
  3. Cexactly equal to its dissolved oxygen value
  4. Dmore than 17 ppm

Answer: B

Clean water has little biodegradable matter, so the BOD is below 5 ppm. Values above 17 ppm indicate a highly polluted sample.
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