Water samples with BOD values of 4ppm and 18 ppm,
Question:

Water samples with BOD values of $4 \mathrm{ppm}$ and $18 \mathrm{ppm}$, respectively, are :

  1. Clean and Clean

  2. Highly polluted and Clean

  3. Clean and Highly polluted

  4. Highly polluted and Highly polluted


Correct Option: , 2

Solution:

Clean water would have BOD value $<5 \mathrm{ppm}$ whereas highly polluted water could have BOD value $\geq 17$ $\mathrm{ppm}$.

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