A-LevelChemistryEquilibriaOct/Nov 2018Paper 1 Q91 Mark
In this question, all pressures are measured in atm. The equation represents the equilibrium between three gaseous substances X, Y and Z. X + 3Y ⇋ 2Z At temperature T₁, the numerical value of Kp, the equilibrium constant, is 2. At a higher temperature T2, the partial pressures at equilibrium are as shown. Which row is correct?
Athe numerical value of Kp at T2: 54/25, the forward reaction is: endothermic
Bthe numerical value of Kp at T2: 54/25, the forward reaction is: exothermic
Cthe numerical value of Kp at T2: 25/54, the forward reaction is: endothermic
Dthe numerical value of Kp at T2: 25/54, the forward reaction is: exothermic
✓ Correct Answer
The correct answer is D. 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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