A-LevelChemistryNitrogen and sulfurFeb/Mar 2020Paper 1 Q151 Mark
Solid ammonium nitrate is put into a test-tube and solution X is added to it. The resulting mixture is warmed and the gas given off is tested with damp red litmus paper. The litmus paper changes colour from red to blue. What could be the identity of X and its role in the reaction?
Aidentity of X: NaOH(aq), role of X: proton donor
Bidentity of X: NaOH(aq), role of X: proton acceptor
Cidentity of X: HCl(aq), role of X: proton donor
Didentity of X: HCl(aq), role of X: proton acceptor
✓ Correct Answer
The correct answer is B. This question tests the candidate's understanding of nitrogen and sulfur 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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