A-LevelChemistryEquilibriaFeb/Mar 2025Paper 1 Q101 Mark

Methanol is manufactured by reacting carbon dioxide and hydrogen together. CO2(g) + 3H2(g) ⇌ CH3OH(g) + H2O(g) ΔH = −49 kJ mol⁻¹ What increases the equilibrium yield of methanol in this process?

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

The correct answer is A: increasing the pressure.

Q: What topic does this question test?

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

Aincreasing the pressure

Badding an excess of steam

Cadding a catalyst

Dincreasing the temperature

✓ Correct Answer

The correct answer is A: increasing the pressure

📋 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 Equilibria 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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