Problem: Which metal(s) can be oxidized with a Pb2+ solution but not with a Cd2+ solution? (Hint: The reactions are occurring under standard conditions.)A. CrB. NiC. ZnD. Sn

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Pb2+ + 2 e  Zn                  E° = ‒0.1262 V

Cd2+ + 2 e  Cd                  E° = ‒0.4030 V


• ↓ E° → oxidation

Loss Electrons → Oxidation → Reducing Agent

• ↑ E° → reduction → cathode

Gain Electrons → Reduction → Oxidizing Agent

can be oxidized with a Pb2+ solution but not with a Cd2+ solution


Cr2+ + 2 e  Cr                 E° = ‒0.913 V

• lower E° than Pb2+/Pb and Cd2+/Cd

• Cr → can be oxidized by both Pb2+ and Cd2+


Ni2+ + 2 e  Ni                  E° = ‒0.257 V

• higher E° than Cd2+/Cd but lower than Pb2+/Pb

• Ni → can be oxidized by Pb2+ but not by Cd2+

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Problem Details

Which metal(s) can be oxidized with a Pb2+ solution but not with a Cd2+ solution? (Hint: The reactions are occurring under standard conditions.)

A. Cr

B. Ni

C. Zn

D. Sn