Answer: F 2.
- A Cl<sub>2</sub>
- B F<sub>2</sub>
- C Br<sub>2</sub>
- D I<sub>2</sub>
Correct answer: B. F<sub>2</sub>
Explanation: Fluorine has the highest standard reduction potential among the halogens, making F<sub>2</sub> the strongest oxidising agent.
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.