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Q.

BOD values of four water samples A, B, C, D are 81ppm, 18ppm, 27ppm and 54ppm respectively. Correct increasing order of pollution in the water samples is

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a

A > D > C > B

b

B > C > D > A

c

B < C < D < A

d

A < D < C < B

answer is C.

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Detailed Solution

BOD ∝Pollution; ∴decreasing oder of pollution; A > D > C > BIncreasing order of pollution; B < C < D < A
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