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Biochemical oxygen demand values of our ...

Biochemical oxygen demand values of our water samples A,B,C and D are respectively 50 ppm, 100 ppm, 150 ppm and 40 ppm. Arrange them in the descending order of their purity.

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More the BOD value, more the extent of pollution and less the purity of water. Thus purity of water samples is in the order `D gt A gt B gt C`
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