Identifying Oxidising & Reducing Agents
Cambridge IGCSE Chemistry 0620 · Paper 4 Redox Analysis · 15 Questions
Section A: Oxygen Transfer
In the reaction Fe₂O₃ + 3CO → 2Fe + 3CO₂, identify the reducing agent.
In the reaction CuO + H₂ → Cu + H₂O, identify the oxidising agent.
In the reaction C + 2CuO → 2Cu + CO₂, which substance is the reducing agent and which is oxidised?
In the thermite reaction: Fe₂O₃ + 2Al → Al₂O₃ + 2Fe, identify the oxidising agent.
In the reaction 2H₂ + O₂ → 2H₂O, identify both the oxidising and reducing agents.
Section B: Electron Transfer
In Mg + Cl₂ → MgCl₂, identify the oxidising agent. Explain in terms of electrons.
In Zn + CuSO₄ → ZnSO₄ + Cu, identify the reducing agent and explain using electrons.
In 2Na + Cl₂ → 2NaCl, which species is oxidised? Explain with a half-equation.
In Fe + 2HCl → FeCl₂ + H₂, identify the oxidising agent using electron transfer.
In the reaction F₂ + 2KI → 2KF + I₂, which halogen is the oxidising agent? Why?
Section C: Oxidation Numbers
In 2SO₂ + O₂ → 2SO₃, identify the reducing agent using oxidation numbers.
In MnO₂ + 4HCl → MnCl₂ + Cl₂ + 2H₂O, determine the oxidation number of Mn in MnO₂ and MnCl₂.
In 2H₂O₂ → 2H₂O + O₂, what are the oxidation numbers of O in H₂O₂, H₂O, and O₂?
In K₂Cr₂O₇ + 14HCl → 2KCl + 2CrCl₃ + 3Cl₂ + 7H₂O, what is the oxidation number of Cr in K₂Cr₂O₇ and CrCl₃?
In 5Fe²⁺ + MnO₄⁻ + 8H⁺ → 5Fe³⁺ + Mn²⁺ + 4H₂O, identify both the oxidising and reducing agents using oxidation numbers.
📋 Golden Rules: Redox Identification
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