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Among Cu, Zn, Pt, Au, which is the noble metal MOST resistant to corrosion?

AAu (E° = +1.5 V, most positive reduction potential)
BPt
CCu
DZn
Answer & Solution
Correct answer: A. Au (E° = +1.5 V, most positive reduction potential)
Gold has the highest reduction potential (E° = +1.5 V), most resistant to corrosion. **Order:** Au > Pt > Cu > Zn (Zn corrodes easily, used as sacrificial anode).
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