A-LevelChemistryEquilibriaMay/June 2021Paper 1 Q331 Mark
When a sample of ammonium chloride is warmed it decomposes into ammonia and hydrogen chloride gas. NH₄Cl(s) → NH₃(g) + HCl(g) reaction 1 [Diagram of apparatus showing NH₄Cl decomposition and reformation] When the mixture of hot ammonia and hydrogen chloride gases hit a cold surface, a white solid of ammonium chloride reforms. Which statements are correct? 1 Reaction 1 is in dynamic equilibrium. 2 Reaction 1 is reversible. 3 Reaction 1 is an endothermic reaction.
A1, 2 and 3 are correct
B1 and 2 only are correct
C2 and 3 only are correct
D1 only is correct
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The correct answer is C. This question tests the candidate's understanding of equilibria within the Chemistrysyllabus. The examiner's mark scheme requires...
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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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