Maximum prescribed limit of $M n$ in drinking water is:

0.005 ppm

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0.05 ppm

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0.0005 ppm

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5 ppm

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Solution

The correct option is D 0.05 ppm
The U.S. EPA Secondary Drinking Water Regulations recommend a limit of 0.05 mg/l manganese because of the staining which may be caused. Hence, maximum prescribed limit of $M n$ in drinking water is 0.05 ppm

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