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(B) According to the $WHO$ and $BIS$ standards for drinking water,the permissible limits for these metals are as follows:$Fe$: $0.2 \ ppm$$Mn$: $0.05

Vedclass · Accepted Answer

$Mn$

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(B) According to the $WHO$ and $BIS$ standards for drinking water,the permissible limits for these metals are as follows:$Fe$: $0.2 \ ppm$$Mn$: $0.05 \ ppm$$Cu$: $3.0 \ ppm$$Zn$: $5.0 \ ppm$In the given sample,the concentration of $Mn$ is $0.05 \ ppm$. While this is at the threshold,$Mn$ is highly sensitive; even slight variations above this limit cause staining and taste issues,making it the most critical metal among the choices that renders water unsuitable for drinking if concentrations exceed the limit.

$A$ water sample has $ppm$ level concentration of the following metals: $Fe = 0.2$,$Mn = 0.05$,$Cu = 3.0$,$Zn = 5.0$. The metal that makes the water sample unsuitable for drinking is

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