If initial D.O. of a sewage sampleis 6mg/l and final D.O. is 2 mg/l. The dilution is 1%.Then the BOD….

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If initial D.O. of a sewage sampleis 6mg/l and final D.O. is 2 mg/l. The dilution is 1%.Then the BOD of the sample is-

Options :-

1. 4 mg/l
   
2. 6 mg/l
   
3. 40 mg/l
   
4. 400 mg/l
   

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