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:
A.
$$Cu$$
B.
$$Mn$$
C.
$$Fe$$
D.
$$Zn$$
Answer :
$$Mn$$
Solution :
The water sample containing $$Mn = 5\,ppm$$ is unsuitable for drinking as the prescribed level for $$Mn$$ in drinking water is $$0.5ppm.$$
Releted MCQ Question on Inorganic Chemistry >> D and F Block Elements
Releted Question 1
When same amount of zinc is treated separately with excess of sulphuric acid and excess of sodium hydroxide, the ratio of volume of hydrogen evolved is