A-LevelChemistryEquilibriaOct/Nov 2023Paper 1 Q261 Mark
NaOH(aq) is added to NH4Cl(aq). The mixture is warmed. The gas that is produced turns damp red litmus paper blue. Which row is correct?
Abehaviour of the ammonium ion in NH4Cl: Brønsted-Lowry acid; behaviour of the water present on the litmus paper: Brønsted-Lowry base
Bbehaviour of the ammonium ion in NH4Cl: Brønsted-Lowry acid; behaviour of the water present on the litmus paper: Brønsted-Lowry acid
Cbehaviour of the ammonium ion in NH4Cl: Brønsted-Lowry base; behaviour of the water present on the litmus paper: Brønsted-Lowry acid
Dbehaviour of the ammonium ion in NH4Cl: Brønsted-Lowry base; behaviour of the water present on the litmus paper: Brønsted-Lowry base
✓ Correct Answer
The correct answer is B. This question tests the candidate's understanding of equilibria 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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