All topicsWhat is the standard reduction potential for Cr²⁺(aq) to Cr(s)? Half-Reaction | E°, V Cr³⁺(aq) + 3e⁻ → Cr(s) |2016 national · question 4010%What is ΔG° at 298 K for the disproportionation of PbO(s)? 2 PbO(s) → PbO₂(s) + Pb(s) ΔG° = ??? Half-reaction 2024 national · question 4211%A molecule absorbs a photon of light to form an excited state. How do the redox properties of the excited stat2024 national · question 4115%
Oxidation and reduction
This is block 7 of 10, questions 37–42 on both the local section exam and national Part I. Across the 41 national questions where ACS published item statistics, qualifiers answered 47% correctly, which makes it the fifth hardest of the 10.
What it covers
oxidation statesbalancing redoxgalvanic cellsstandard potentialsNernst equationelectrolysisFaraday's law
Where qualifiers lose points
% who got it rightThese are the oxidation and reduction questions the fewest national qualifiers answered correctly. If you can do these, the block is not your problem.
Every question is from a published past exam and carries its source. Practice adapts to what you miss, and anything you get wrong comes back on a spaced schedule. No account needed. See the other nine blocks.