Question: The maximum prescribed concentration of copper in drinking water is:
$5 \mathrm{ppm}$
$0.05 \mathrm{ppm}$
$0.5 \mathrm{ppm}$
$3 \mathrm{ppm}$
Correct Option: , 4
Solution:
Maximum prescribed concentration of $\mathrm{Cu}$ in drinking water is $3 \mathrm{ppm}$.
