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  1. A waste water sample diluted to 100 times with aeration water had an initial dissolved oxygen (DO) of 7.0 mg/l and after 5 days of incubation at 20°C, the DO was zero. The BOD of waste water is :

    2. A.
    700 mg/l
    B.
    100 mg/l
    C.
    cannot be determined
    D.
    7mg/l

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    Answer : Option A

    Explanation :

    No answer description available for this question. Let us discuss.

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