A-LevelChemistryGroup 2May/June 2016Paper 1 Q161 Mark

A solid, T, was placed in an excess of the liquid U. A colourless gas was given off and a white precipitate was seen. The precipitate was not T. What could be the identities of T and U? T U BaCO₃ H₂O Ca dilute H₂SO₄ Mg dilute H₂SO₄ SrCO₃ dilute HCl

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

The correct answer is B: Ca dilute H₂SO₄.

Q: What topic does this question test?

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

ABaCO₃ H₂O

BCa dilute H₂SO₄

CMg dilute H₂SO₄

DSrCO₃ dilute HCl

✓ Correct Answer

The correct answer is B: Ca dilute H₂SO₄

📋 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 May/June 2016 examination, Paper 1 Variant 2.

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