A-LevelChemistryGroup 17Oct/Nov 2020Paper 1 Q141 Mark
AgNO₃(aq) is added to a solution of a halide ion, X⁻(aq), and aqueous ammonia is then added. The ionic equations for the two reactions that occur are shown. Ag⁺(aq) + X⁻(aq) ⇌ AgX(s) equilibrium 1 Ag⁺(aq) + 2NH₃(aq) ⇌ Ag(NH₃)₂⁺(aq) equilibrium 2 Which statement is correct?
AThe position of equilibrium 1 lies to the left when X⁻ = I⁻.
BIncreasing the concentration of ammonia causes the position of equilibrium 1 to move to the left.
CK for equilibrium 2 is larger when X⁻ = Cl⁻ than when X⁻ = I⁻.
DEquilibrium 2 is a redox reaction.
✓ Correct Answer
The correct answer is B. 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...
🔒
Unlock the Examiner's Answer
Sign up for free to reveal the correct answer, the official mark scheme breakdown, and the examiner trap analysis for this question.
Sign Up Free to Unlock →Join thousands of Cambridge students already using Oracle Prep