Identify the correct statement from below. (a) A mere 0.1 % impurities make domestic sewage unfit...

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Identify the correct statement from below.
(a) A mere 0.1 % impurities make domestic sewage unfit for human use
(b) BOD of clean water is 5 ppm and highly polluted water is 17 ppm
(c) Both (a) and (b)
(d) None of the above

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