Of the following elements,________ is the most difficult to oxidize. Cu
Hg
Au
Ag
Na
A)Cu, Hg, and Au
B)Hg and Ag
C)Au only
D)Ag only
E)Na only

Question

Quizplus · Accepted Answer

Au (gold) has the highest standard reduction potential in the electrochemical series, which means it is the most difficult to oxidize and is the most noble metal. The other metals listed, Cu (copper), Hg (Mercury), Ag (Silver), and Na (Sodium) all have lower standard reduction potentials than Au and are therefore easier to oxidize.

Of the Following Elements,________ Is the Most Difficult to Oxidize