A-LevelChemistryChemical energeticsMay/June 2021Paper 1 Q81 Mark

Nitrogen and oxygen can react together to form nitrogen monoxide, NO. N₂ + O₂ ⇌ 2NO ΔH = +180 kJ mol⁻¹ What is the bond energy of the bond between the atoms in NO?

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

The correct answer is A: 630 kJ mol⁻¹.

Q: What topic does this question test?

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

A630 kJ mol⁻¹

B810 kJ mol⁻¹

C1260 kJ mol⁻¹

D1620 kJ mol⁻¹

✓ Correct Answer

The correct answer is A: 630 kJ mol⁻¹

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

Source

This question appeared in the Cambridge A-Level Chemistry May/June 2021 examination, Paper 1 Variant 2.

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