Answer: 0.
- A 0
- B +1
- C -2
- D +4
Correct answer: A. 0
Explanation: Average oxidation state of C in C₆H₁₂O₆: C₆H₁₂O₆ = 0 charge. 6C + 12(+1) + 6(-2) = 0. 6C = 0. Average oxidation state of C = 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.