A-LevelChemistryElectrochemistryFeb/Mar 2017Paper 1 Q81 Mark
HOCl(aq) is the molecule that kills bacteria when chlorine is added to water. The following reaction produces this molecule. Cl₂(g) + H₂O(l) ⇌ HOCl(aq) + H⁺(aq) + Cl⁻(aq) Which statement about this reaction is correct?
AChlorine is both oxidised and reduced.
BChlorine is oxidised but not reduced.
CHydrogen is both oxidised and reduced.
DHydrogen is oxidised but not reduced.
✓ Correct Answer
The correct answer is A. This question tests the candidate's understanding of electrochemistry within the Chemistrysyllabus. The examiner's mark scheme requires...
📋 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...
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