Answer: Oxidation of iron.
- A Reduction of iron
- B Oxidation of iron
- C Neutralisation
- D Decomposition without redox
Correct answer: B. Oxidation of iron
Explanation: In rusting, iron (Fe, oxidation state 0) is oxidised to Fe²⁺/Fe³⁺ in iron oxides/hydroxides by atmospheric oxygen and moisture.
Electron transfer in a redox reaction: zinc loses electrons (oxidised, acts as reducing agent) and copper(II) ions gain those same electrons (reduced, acts as oxidising agent).
Concept context
Master electron transfer in chemistry: assign oxidation states, balance half-reactions, identify oxidising and reducing agents, and connect redox to everyday reactions.