A-LevelChemistryEquilibriaMay/June 2010Paper 1 Q111 Mark
The percentage of ammonia obtainable, if equilibrium were established during the Haber process, is plotted against the operating pressure for two temperatures, 400°C and 500 °C. Which diagram correctly represents the two graphs?
AGraph shows %NH3 at equilibrium increasing with pressure; 400°C curve is above 500°C curve.
BGraph shows %NH3 at equilibrium decreasing with pressure; 500°C curve is above 400°C curve.
CGraph shows %NH3 at equilibrium increasing with pressure; 500°C curve is above 400°C curve.
DGraph shows %NH3 at equilibrium decreasing with pressure; 400°C curve is above 500°C curve.
✓ Correct Answer
The correct answer is A. This question tests the candidate's understanding of equilibria within the Chemistrysyllabus. The examiner's mark scheme requires...
📋 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...
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