A-LevelChemistryChemical bonding9701/12 · Feb/Mar 2022 · Q51 Mark

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

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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

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

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Topic: Chemical bonding, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, Feb/Mar 2022 Paper 1 Variant 2, question 5.

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