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

Q: What topic does this question test?

This question tests Electrochemistry in A-Level Chemistry (syllabus code 9701). It is worth 1 mark.

Avanadium is oxidised, iodine is oxidised

Bvanadium is oxidised, iodine is reduced

Cvanadium is reduced, iodine is oxidised

Dvanadium is reduced, iodine is reduced

✓ Correct Answer

The correct answer is C: vanadium is reduced, iodine is oxidised

📋 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.

🔒

Unlock the Examiner's Analysis

Join thousands of Cambridge students already using Oracle Prep

About This A-Level Chemistry Question

Topic

This multiple-choice question tests Electrochemistry in A-Level Chemistry (syllabus code 9701). It is worth 1 mark.

Source

This question appeared in the Cambridge A-Level Chemistry Feb/Mar 2021 examination, Paper 1 Variant 2.

Practice on Oracle Prep

Oracle Prep provides AI-powered practice for all Cambridge O-Level and A-Level subjects. Our platform includes topic predictions with 87.7% accuracy, AI essay grading, and a comprehensive question bank spanning 25 years of past papers across 29 subjects.