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

Step-by-step solution

The concentration of the ions for drinking water are, Fe ≤ 0 .2   ppm Mn ≤ 0 .05   ppm Cu ≤ 3 .0   ppm Zn ≤ 5 .0   ppm Here, Mn concentration is greater than the allowed limit. So, it makes the water sample unsuitable for drinking.