A-LevelChemistryReaction kinetics9701/12 · Feb/Mar 2017 · Q101 Mark
Oxidation of ethanedioate ions by acidified manganate(VII) ions is very slow at room temperature. 2MnO₄⁻ + 5C₂O₄²⁻ + 16H⁺ → 2Mn²⁺ + 10CO₂ + 8H₂O Mn²⁺ ions catalyse this reaction. Which graph shows how the concentration of acidified manganate(VII) ions varies after ethanedioate ions are added?
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.
A[Graph showing concentration of MnO₄⁻ decreasing slowly at first, then more rapidly, then levelling off.]
B[Graph showing concentration of MnO₄⁻ decreasing rapidly from the start, then levelling off.]
C[Graph showing concentration of MnO₄⁻ decreasing very slowly at first, then rapidly, then levelling off.]
D[Graph showing concentration of MnO₄⁻ increasing.]
✓ Correct answer
B: [Graph showing concentration of MnO₄⁻ decreasing rapidly from the start, then levelling off.]
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