A-LevelChemistryNitrogen and sulfurMay/June 2011Paper 1 Q351 Mark
When the yellow liquid NCl3 is stirred into aqueous sodium hydroxide, the reaction that occurs can be represented by the following equation. 2NCl3(l) + 6NaOH(aq) → N2(g) + 3NaCl(aq) + 3NaOCl(aq) + 3H2O(l) What will be the result of this reaction? 1 The nitrogen undergoes a redox reaction. 2 A bleaching solution remains after the reaction. 3 The final solution gives a precipitate with acidified silver nitrate.
A1, 2 and 3 are correct
B1 and 2 only are correct
C2 and 3 only are correct
D1 only is correct
✓ Correct Answer
The correct answer is A: 1, 2 and 3 are correct
📋 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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