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

Clean and Clean

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Clean and Highly polluted

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Highly polluted and Clean

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Highly polluted and Highly polluted

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Solution

The correct option is B Clean and Highly polluted
Clean water would have BOD value of less than 5 ppm whereas highly polluted water could have a BOD value of 17 ppm or more.
Option (c) is correct.

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Similar questions

B O D

4 p p m

18 p p m

C a (H C O_{3})_{2}

M g (H C O_{3})_{2}

C a S O_{4}

M g S O_{4}

5 p p m

M g S O_{4}

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