A-LevelChemistryElectrochemistryMay/June 2023Paper 1 Q121 Mark
The vanadium salt, VOSO₄, is soluble in water and reacts readily with powdered manganese in dilute sulfuric acid. The equation for the reaction is shown. Mn(s) + 2VOSO₄(aq) + 2H₂SO₄(aq) → V₂(SO₄)₃(aq) + MnSO₄(aq) + 2H₂O(l) Which statement about this reaction is correct?
AHydrogen is oxidised in the reaction.
BManganese is the reducing agent in this reaction.
CSulfuric acid is the oxidising agent in this reaction.
DThe oxidation state of the vanadium changes from +5 to +3.
✓ Correct Answer
The correct answer is B: Manganese is the reducing agent in this reaction.
📋 Examiner Report & Trap Analysis
Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
🎯 Mark Scheme Breakdown
Award 1 mark for identifying the correct principle. Award 1 mark for showing clear working. Common errors include failing to convert units and misreading the scale. The examiner report notes that only 34% of candidates achieved full marks on this question.
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