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The measured BOD values for four different water samples (A-D) are as follows:
A = 3 ppm: B = 18 ppm: C = 21 ppm: D = 4 ppm. The water samples which can be called as highly polluted with organic wastes, are

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A and D

B and D

A and B

B and C

answer is C.

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Detailed Solution

BOD for clean water < 5 ppm

greater the BOD value greater is the level of pollution

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