Environmental Chemistry - Result Question 7
####7. The maximum prescribed concentration of copper in drinking water is
(a) 5 ppm
(b) $0.5 ppm$
(c) $0.05 ppm$
(d) $3 ppm$
(2019 Main, 8 April II)
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Answer:
Correct Answer: 7. (b)
Solution:
- According to W.H.O. and US environmental protection agency guidelines, maximum allowable concentration of metals in drinking water are as follows :
| Metal | Maximum concentration $\left(ppm\right.$ or $\left.mg dm^{-3}\right)$ |
|---|---|
| $Cd$ | 0.005 |
| $Mn$ | 0.05 (option-c) |
| $Al$ | 0.2 |
| $Fe$ | 0.2 |
| $Cu$ | 3.0 (option-d) |
| $Zn$ | 5.0 (option-a) |
