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A sample of ground water has following contaminations :

Species Concentration
$N O_{3}^{-}$ 35 ppm
$P b$ 20 ppb
$S O_{4}^{2 -}$ 400 ppm
Cd 0.2 ppm
This sample is unsuitable for drinking due to presence of :

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$P b$

$S O_{4}^{2 -}$ ions

$N O_{3}^{-}$ ions

answer is D.

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Detailed Solution

Max. permissible concentration of Cd in drinking water is 0.005 ppm.

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