A water sample has ppm level concentration of the following metals: $F e = 0.2; M n = 5.0; C u = 3.0; Z n = 5.0$ . The metal that makes the water sample unsuitable for drinking is:

F e

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M n

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Z n

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C u

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Solution

The correct option is B $M n$

Metals Maximum Concentration
(in ppm)

$Z n F e M n C u A l C d$ $5.0 0.2 0.05 3.0 0.2 0.005$

These are the permissible concentration of few metals in drinking water.

In the given water sample, the concentration of $M n = 5.0$ that is greater than 0.05.

Hence, Mn makes the water sample unsuitable for drinking.
The correct answer is option (c)

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F^{-} = 10, S O_{4}^{2 -} = 100, N O_{3}^{-} = 50

F^{-} = 10; S O_{3}^{2 -} = 100; N O_{3}^{-} = 50

F^{-} = 10; S O_{3}^{2 -} = 100; N O_{3}^{-} = 50

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Metals	Maximum Concentration (in ppm)
$Z n F e M n C u A l C d$	$5.0 0.2 0.05 3.0 0.2 0.005$