Question:
Water samples with BOD values of $4 \mathrm{ppm}$ and 18 ppm, respectively, are :
Correct Option: , 3
Solution:
Clean water would have BOD value of less than $5 \mathrm{ppm}$ whereas highly polluted water could have a $B O D$ value of $17 \mathrm{ppm}$ or more.
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