Nitrogen dioxide, NO2, is a brown gas. Dinitrogen tetroxide, N2O4, is a colourless gas. An equilibrium is established between NO2 and N2O4 in a closed vessel. 2NO2(g) (brown) ⇌ N2O4(g) (colourless) ∆H = −57 kJ mol⁻¹ Which row describes the effects of changing conditions on the colour of an equilibrium mixture of NO2 and N2O4?
✓ Correct Answer
The correct answer is C: increasing the pressure: colour becomes lighter, increasing the temperature: colour becomes darker
📋 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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