A-LevelChemistryGroup 2Feb/Mar 2017Paper 1 Q141 Mark

Why does barium react more rapidly with cold water than magnesium does?

Q: What topic does this question test?

This question tests Group 2 in A-Level Chemistry (syllabus code 9701). It is worth 1 mark.

ABarium atoms are larger and form ions more easily than magnesium atoms.

BBarium floats on the surface of the water but magnesium sinks in the water.

CBarium hydroxide is less soluble than magnesium hydroxide.

DThe sum of the 1st and 2nd ionisation energies of barium is more than that for magnesium.

✓ Correct Answer

The correct answer is A: Barium atoms are larger and form ions more easily than magnesium atoms.

📋 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 Group 2 in A-Level Chemistry (syllabus code 9701). It is worth 1 mark.

Source

This question appeared in the Cambridge A-Level Chemistry Feb/Mar 2017 examination, Paper 1 Variant 2.

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