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Question

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:
  1. Zn
  2. Fe
  3. Mn
  4. Cu

A
Zn
B
Fe
C
Mn
D
Cu
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