A-LevelChemistryChemical periodicityMay/June 2021Paper 1 Q131 Mark

L and M are elements in Period 3 of the Periodic Table. • The oxide of L is a solid at room temperature. This oxide has a giant structure. • The chloride of L does not react with water. • Argon is the only element in Period 3 with a lower melting point than M. Which formula represents a compound of elements L and M?

Q: What topic does this question test?

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

AAl₂S₃

BMgS

CNaCl

DPCl₅

✓ Correct Answer

The correct answer is C: NaCl

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

Source

This question appeared in the Cambridge A-Level Chemistry May/June 2021 examination, Paper 1 Variant 2.

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