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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.

List-$I$	List-$II$
$(A)$ Oxides of sulphur	$(1)$ Global warming
$(B)$ Nitrogen dioxide	$(2)$ Damage to kidney
$(C)$ Carbon dioxide	$(3)$ Blue baby syndrome
$(D)$ Nitrate in drinking water	$(4)$ Respiratory diseases
$(E)$ Lead	$(5)$ Red haze in traffic and congested areas

$A$ 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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