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