In a redox reaction, which species is the reducing agent?

In the redox reaction Cr2O7^{2-}(aq) + Cu^+(aq) → Cr^{3+}(aq) + Cu^{2+}(aq), which species is oxidized?

In redox reactions, oxidation is best defined as which process, and reduction is best defined as which process?

Which of the following chemical reactions is an oxidation-reduction (redox) reaction?

Which statement best describes a redox reaction?

In the context of redox reactions, which term best describes a reduction process?

In a redox reaction, which term best describes a reduction?

Which balanced equation represents a redox reaction (i.e., involves a change in oxidation numbers)?

Which of the following equations represents a redox reaction (a reaction in which oxidation numbers change)?