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Four water samples A, B, C and D have the BOD values of 18ppm, 9ppm, 45ppm and 54ppm respectively. Most toxic sample is

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answer is D.

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Detailed Solution

BOD $α$ Toxicity.
Moreover, 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.
Thus, water sample D with BOD value of 54 ppm is the most toxic sample among given choices.

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