AQA · OCR A · Year 13
Hard electrode potential questions
Unfamiliar redox couples, missing electrode potentials, selective reductions and wording traps drawn from the mistakes examiners repeatedly report.
unfamiliar datamissing E°selective redoxprecise explanations
Fresh question
Decide the chemistry before the arithmetic
0first-time correct0completed
One rule throughout
The more positive E° couple runs as the reduction. Reverse the other half-equation for oxidation, balance electrons, add the equations, then calculate the potential difference. The worked answer also shows the wording an examiner can mark unambiguously.