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Biochemical oxygen demand value of four ...

Biochemical oxygen demand value of four water samples P, Q, R and S are respectively 100 ppm, 50 ppm,150 ppm and 10 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 the water samples is in the order `S gt Q gt P gt R gt `
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