Environmental Chemistry - Result Question 22
22. A water sample has ppm level concentration of the following metals: $Fe=0.2 ; Mn=5.0 ; Cu=3.0 ; Zn=5.0$. The metal that makes the water sample unsuitable for drinking is
(2019 Main, 9 Jan I)
(a) $Cu$
(b) $Fe$
(c) $Mn$
(d) $Zn$
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Answer:
Correct Answer: 22. (c)
Solution:
- For drinking water, the maximum recommended levels of some metals, set by European Environment Commission (EEC) is
| Metal | Max. concentration in ppm |
|---|---|
| $Zn$ | 5 |
| $Mn$ | 0.05 |
| $Fe$ | 0.2 |
| $Cu$ | 3 |
As the concentration of $Mn$ in the given water sample is more than the recommended concentration. Thus, it makes water unsuitable for drinking.
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