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Question

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

A
highly polluted and clean
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B
highly polluted and highly polluted
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C
clean and highly polluted
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D
clean and clean
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Solution

The correct option is A 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.

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