A-LevelChemistryElectrochemistryFeb/Mar 2021Paper 1 Q81 Mark
VO₂Cl reacts with NaI under acidic conditions. 2VO₂Cl + 2H₂SO₄ + 2NaI → VOCl₂ + VOSO₄ + I₂ + Na₂SO₄ + 2H₂O The oxidation state of Cl is −1 in VO₂Cl and in VOCl₂. Which row about this reaction is correct? vanadium iodine A is oxidised is oxidised B is oxidised is reduced C is reduced is oxidised D is reduced is reduced
Avanadium is oxidised, iodine is oxidised
Bvanadium is oxidised, iodine is reduced
Cvanadium is reduced, iodine is oxidised
Dvanadium is reduced, iodine is reduced
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The correct answer is C. This question tests the candidate's understanding of electrochemistry within the Chemistrysyllabus. The examiner's mark scheme requires...
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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...
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