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Q.

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

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a

Highly polluted and clean

b

Highly polluted and highly polluted

c

Clean and polluted

d

Clean and clean

answer is C.

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Detailed Solution

Clean water would have BOD value of less than 5ppm whereas highly polluted water could have a BOD value of 17ppm or more
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