Question

Which of following heavy metals does not belong to a category of chemical pollutants?

• A. $Cd$
• B. $Hg$
• C. $Ni$
• D. $Fe$

Answer 1

The correct option is D $Fe$

Water soluble inorganic chemicals that include heavy metals such as cadmium, mercury, nickel etc. constitute an important class of pollutants. $Fe$ does not act as a chemical pollutant, although in an excess amount it may not be good but it is not a pollutant.