From the following select the metal for which maximum prescribed concentration in drinking water in minimum.

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Solution

The correct option is A Cd
the permissible limits of various metals in drinking water are as follows
Iron = 0.3 ppm ( parts per million )
Copper = 1 ppm
Cadmium = 0.005 ppm
Manganese = 0.05 ppm
Thus answer should be C

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