A-LevelChemistryEquilibriaOct/Nov 2022Paper 1 Q71 Mark
Hydrogen peroxide decomposes slowly at 20 °C to form water and oxygen. 2H2O2 ⇌ 2H2O + O2 equilibrium constant = Kc The reaction is faster when a catalyst is present. Which statement is correct?
AThe catalyst alters the Boltzmann distribution so that the reactant molecules have more energy.
BThe catalyst has no effect on the value of Kc.
CThe catalyst increases the value of Kc.
DThe catalyst provides a different reaction mechanism with a higher activation energy.
✓ Correct Answer
The correct answer is B. 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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