- oxygen has an oxidation number of -2 (except for hydrogen peroxide, where the oxidation state is -1)
- hydrogen has an oxidation number of +1 (except when it exists as a hydride e.g. NaH, where its oxidation state is -1)
- for most compounds, the oxidation state of each element is usually the same as the charge of the ions they form.
Hydrogen peroxide (H2O2) acts as an oxidising agent, oxidising potassium iodide (KI) to iodine (I2). Hydrogen peroxide itself is reduced to water. As such, potassium iodide is the reducing agent here.
Related Google Apps
- Quizzes and Tests on Redox Reactions