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(C) $BOD$ (Biochemical Oxygen Demand) refers to the amount of oxygen that would be consumed if all the organic matter in one liter of water were oxidi

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Sample $w$

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(C) $BOD$ (Biochemical Oxygen Demand) refers to the amount of oxygen that would be consumed if all the organic matter in one liter of water were oxidized by bacteria.Greater $BOD$ of waste water indicates higher pollution levels because more organic matter is present for decomposition.Comparing the given values:Sample $w = 6 \ mg/L$Sample $x = 6.5 \ mg/L$Sample $y = 7 \ mg/L$Sample $z = 10.3 \ mg/L$Since Sample $w$ has the lowest $BOD$ value $(6 \ mg/L)$,it contains the least amount of organic matter and therefore has the lowest level of pollution.

The following water samples are given with their $BOD$ values. Which sample has the lowest level of pollution?
Sample $w - 6 \ mg/L$,Sample $x - 6.5 \ mg/L$
Sample $y - 7 \ mg/L$,Sample $z - 10.3 \ mg/L$

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The following water samples are given with their $BOD$ values. Which sample has the lowest level of pollution?Sample $w - 6 \ mg/L$,Sample $x - 6.5 \ mg/L$Sample $y - 7 \ mg/L$,Sample $z - 10.3 \ mg/L$