Which of the following metals, Ag,Zn,Cu,Ni,Au,Pt,Sn,Cannot be extracted by hydrometallurgical reduction of their ions with hydrogen?
A) Au, Pt
B) Ag, Au, Pt
C) Zn, Ni, Au
D) Zn, Ni, Sn
E) Ag, Cu, Au, Pt

Question

Quizplus · Accepted Answer

Zn, Ni, and Sn cannot be extracted by hydrometallurgical reduction with hydrogen because their standard electrode potentials are more negative than that of hydrogen. This means they have a stronger tendency to remain in their ionized form in solution rather than being reduced to the metal by hydrogen gas.

Which of the Following Metals, Ag,Zn,Cu,Ni,Au,Pt,Sn,Cannot Be Extracted by Hydrometallurgical