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Biochemical oxygen demand values off our...

Biochemical oxygen demand values off 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.

Text Solution

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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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