Discussion
A metal will displace another from its salt solution if the first metal's standard potential is
Answer: B
Correct answer: more negative than the second’s
Displacement requires the first metal to be the better reducing agent, that is to lose electrons more readily, which means the more negative standard potential. Zinc at \( -0.76 \) V displaces copper at \( +0.34 \) V from its sulphate, and the reverse cannot happen. This is precisely what the electrochemical series is for: any metal displaces any metal below it in the list.
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