Rank Cd, Cu, and Zn from the metal that is easiest to oxidize to the metal that is the most difficult to oxidize.

Rank Cd, Cu, and Zn from the metal that is easiest to oxidize to the metal that is the most difficult to oxidize. Correct Answer Zn > Cd > Cu

(C) In the three cells, the standard cell voltages are all positive. So we can say that both Zn and Cd will reduce Cu2+ ions. We see from the third cell that Zn reduces Cd. Since Zn will reduce both Cd2+ and Cu2+, Zn is also the easiest to oxidize. Since Cd reduces Cu2+, Cd is easier to oxidize than Cu. This results in the chosen sequence.
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