A-LevelChemistryEquilibria9701/12 · May/June 2021 · 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.
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
A1, 2 and 3 are correct
B1 and 2 only are correct
C2 and 3 only are correct
D1 only is correct
✓ Correct answer
C: 2 and 3 only are correct
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