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Which of the following statements is fal...

Which of the following statements is false?

A

Lower the concentration of `D.O` the more polluted is the water sample.

B

The tolerable limit of lead in drinking water is 50 ppm

C

Water is considered pure if it has `BOD` less than 5 ppm

D

Microbials are not oxidized by oxidizing agents like `K_(2)Cr_(2)O_(7)`

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The correct Answer is:
4
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