A-LevelChemistryChemical bondingFeb/Mar 2022Paper 1 Q51 Mark

Which dot-and-cross diagram is correct for Al₂Cl₆? [Figure 5.1]

Q: What topic does this question test?

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

ADiagram showing two separate Al³⁺ ions and six Cl⁻ ions.

BDiagram showing a dimeric Al₂Cl₆ molecule with two bridging chlorine atoms, all atoms having complete octets where applicable.

CDiagram showing a dimeric Al₂Cl₆ molecule but with incorrect electron arrangement around some chlorine atoms.

DDiagram showing a dimeric Al₂Cl₆ molecule but with incorrect electron arrangement and bonding.

✓ Correct Answer

The correct answer is B: Diagram showing a dimeric Al₂Cl₆ molecule with two bridging chlorine atoms, all atoms having complete octets where applicable.

📋 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 Chemical bonding in A-Level Chemistry (syllabus code 9701). It is worth 1 mark.

Source

This question appeared in the Cambridge A-Level Chemistry Feb/Mar 2022 examination, Paper 1 Variant 2.

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