The BOD values of four samples of water A, B,C and D are 165 ppm, 120 ppm, 20 ppm and 5 ppm respectively. The most polluted and least polluted water samples are

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A&B

B&C

C&D

A&D

answer is D.

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Detailed Solution

COD∞ degee of pollution,so most polluted A and D is least polluted

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