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     EduGorilla 
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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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