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
A&B
b
B&C
c
C&D
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