Key Exam Tip:
In displacement reactions, the more reactive element (or substance) displaces the less reactive element. Reactivity can be determined by:
• Oxidation Potential: A higher (more positive) oxidation potential means greater tendency to oxidize, hence higher reactivity.
• Reduction Potential: A lower (more negative) reduction potential means greater tendency to oxidize, hence higher reactivity.
In this case, A has a higher oxidation potential than B, so A is more reactive.