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

Question:

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

  1. Highly polluted and Clean

  2. Highly polluted and Highly polluted

  3. Clean and Highly polluted

  4. Clean and Clean


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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