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Q.

The BOD values of four samples of water A, B, C and D are 200PPM, 140PPM, 40PPM, and 4PPM respectively. The most polluted and least polluted water samples are

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a

A & B

b

B & C

c

C & D

d

A & D

answer is D.

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Detailed Solution

More the BOD value more the extent of pollution less BOD value least pollution.
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The BOD values of four samples of water A, B, C and D are 200PPM, 140PPM, 40PPM, and 4PPM respectively. The most polluted and least polluted water samples are