1) Zn(s) + Cu²⁺(aq) → Zn²⁺(aq) + Cu(s) Which species is the oxidising agent? a) Zn b) Cu²⁺ c) Zn²⁺ d) Cu 2) Which if the following is a correct oxidation half-reaction? a) Fe³⁺ + e⁻ → Fe²⁺ b) Cl₂ + 2e⁻ → 2Cl⁻ c) Zn → Zn²⁺ + 2e⁻ d) O₂ + 4e⁻ → 2O²⁻ 3) In acidic solution, the unbalanced redox reaction is: MnO₄⁻ + Fe²⁺ → Mn²⁺ + Fe³⁺ Q: After balancing, how many electrons are transferred? a) 1 b) 2 c) 3 d) 5 4) Oxidation always happens at the cathode. a) true b) false 5) In a redox reaction, one species is always reduced. a) true b) false 6) You must balance electrons in redox equations. a) true b) false

Balancing Redox Reactions

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