Answer: Positive and negative.
- A Positive and positive
- B Negative and negative
- C Positive and negative
- D Negative and positive
Correct answer: C. Positive and negative
Explanation: ΔG° = −nFE°<sub>cell</sub>; spontaneity requires ΔG° < 0, which needs E°<sub>cell</sub> > 0.
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.