Concept:Coinage metals (Group 11: Cu, Ag, Au) are highly unreactive, noble-like metals. Their properties are defined by their position in the electrochemical series relative to the Standard Hydrogen Electrode (SHE).
Solution:- Because they are very stable, they do not want to lose electrons (oxidize).
- This means they have very low oxidation potentials and correspondingly high (positive) reduction potentials.
- In the electrochemical series, elements with positive reduction potentials lie below SHE (Hydrogen = 0.00V).
- Because they are below Hydrogen, they cannot displace \(H_2\) from dilute acids.
- Since they do not readily lose electrons to reduce other species, they are extremely weak reducing agents.
Why other options are incorrect:- Options B, C, and D are all factually true statements about coinage metals. Therefore, Option A (claiming they are powerful reducing agents) is the only false statement.
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