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:

  1. 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)


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