A-LevelChemistryGroup 17Oct/Nov 2014Paper 1 Q161 Mark
Chlorine gas reacts with cold aqueous sodium hydroxide. It can also react with hot aqueous sodium hydroxide. What are the oxidation numbers of chlorine in the products of these reactions? [Table with columns: cold aqueous sodium hydroxide, hot aqueous sodium hydroxide]
A-1, +1 -1, +5
B-1, +1 +1, +6
C-1, +2 -1, +5
D-1, +2 +1, +6
✓ Correct Answer
The correct answer is A: -1, +1 -1, +5
📋 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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