A-LevelChemistryEquilibriaFeb/Mar 2019Paper 1 Q111 Mark

When copper is added to a solution of silver ions, the following equilibrium is established. Cu(s) + 2Ag⁺(aq) ⇌ Cu²⁺(aq) + 2Ag(s) Kᶜ = 1.0 × 10⁵ What is the concentration of silver ions at equilibrium when [Cu²⁺] = 0.10 mol dm⁻³?

Q: What is the correct answer to this A-Level Chemistry question?

The correct answer is C: 1.0 × 10⁻³ mol dm⁻³.

Q: What topic does this question test?

This question tests Equilibria in A-Level Chemistry (syllabus code 9701). It is worth 1 mark.

A5.0 × 10⁻⁷ mol dm⁻³

B5.0 × 10⁻⁴ mol dm⁻³

C1.0 × 10⁻³ mol dm⁻³

D1.0 × 10⁻² mol dm⁻³

✓ Correct Answer

The correct answer is C: 1.0 × 10⁻³ mol dm⁻³

📋 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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About This A-Level Chemistry Question

Topic

This multiple-choice question tests Equilibria in A-Level Chemistry (syllabus code 9701). It is worth 1 mark.

Source

This question appeared in the Cambridge A-Level Chemistry Feb/Mar 2019 examination, Paper 1 Variant 2.

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