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BOD and COD

Four samples ...

Question

Four samples of water A, B, C and D have the DO values 1 mg/litre, 3mg/litre, 5 mg/litre and 8mg/litre respectively. Which one is more polluted sample of water?

A

A

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B

B

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C

C

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D

D

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Solution

The correct option is A A
Less the value of DO greater will be the chances of polluted water.

As water becomes more polluted, the level of dissolved oxygen decreases in water.

Among the given samples, A is the most polluted water sample.

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