A-LevelChemistryAtoms, molecules and stoichiometryOct/Nov 2016Paper 1 Q41 Mark

When copper reacts with a 50% solution of nitric acid, nitrogen monoxide is evolved and a blue solution results. The balanced equation for this reaction is shown. pCu + qHNO₃ → rCu(NO₃)₂ + sH₂O + tNO What are the values of the integers p, q, r, s and t?

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

The correct answer is D: p=3, q=8, r=3, s=4, t=2.

Q: What topic does this question test?

This question tests Atoms, molecules and stoichiometry in A-Level Chemistry (syllabus code 9701). It is worth 1 mark.

Ap=1, q=4, r=1, s=2, t=2

Bp=2, q=6, r=2, s=3, t=2

Cp=2, q=8, r=2, s=4, t=4

Dp=3, q=8, r=3, s=4, t=2

✓ Correct Answer

The correct answer is D: p=3, q=8, r=3, s=4, t=2

📋 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 Atoms, molecules and stoichiometry in A-Level Chemistry (syllabus code 9701). It is worth 1 mark.

Source

This question appeared in the Cambridge A-Level Chemistry Oct/Nov 2016 examination, Paper 1 Variant 2.

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