A-LevelChemistryChemical periodicityFeb/Mar 2025Paper 1 Q201 Mark

J is either MgCl2 or AlCl3. K is either SiO2 or SiCl4. J(aq) add drops of aqueous sodium hydroxide -> white precipitate -> add an excess of aqueous sodium hydroxide -> precipitate dissolves K add water -> misty white fumes and a white precipitate in a solution with pH less than 7 Which row is correct?

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

The correct answer is A: AlCl3 SiCl4.

Q: What topic does this question test?

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

AAlCl3 SiCl4

BAlCl3 SiO2

CMgCl2 SiCl4

DMgCl2 SiO2

✓ Correct Answer

The correct answer is A: AlCl3 SiCl4

📋 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 Feb/Mar 2025 examination, Paper 1 Variant 2.

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