A-LevelChemistryGroup 17Feb/Mar 2024Paper 1 Q211 Mark
This question is about two salts, NaI and NaCl. The two solid salts are separately added to warm concentrated H₂SO₄ and the results noted. Aqueous solutions of the two salts are separately added to AgNO₃(aq) and then concentrated NH₃(aq) is added and the results noted. Which row is correct?
Asalt: NaCl, identity of one product formed with concentrated H₂SO₄: Cl₂, observation after AgNO₃(aq) and NH₃(aq) are added: colourless solution
Bsalt: NaCl, identity of one product formed with concentrated H₂SO₄: H₂S, observation after AgNO₃(aq) and NH₃(aq) are added: white precipitate
Csalt: NaI, identity of one product formed with concentrated H₂SO₄: H₂S, observation after AgNO₃(aq) and NH₃(aq) are added: yellow precipitate
Dsalt: NaI, identity of one product formed with concentrated H₂SO₄: I₂, observation after AgNO₃(aq) and NH₃(aq) are added: colourless solution
✓ Correct Answer
The correct answer is C. This question tests the candidate's understanding of group 17 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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