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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.