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:

Z n

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F e

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M n

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C u

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Solution

The correct option is C $M n$
If the water sample contains less than the below values (in ppm) then the water is suitable for drinking,
$Z n = 5.0, F e = 0.2, M n = 0.05, C u = 3.0$

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