AS & A Level Chemistry (9701) — May–June 2025, Paper 37
3 questions · every question answerable online with instant point-by-point AI marking against the official mark scheme.
Start with Question 1 →Question 1 · 14 marks · Practical skills: titration technique, recording data
Hydrogen peroxide, H2O2, reacts rapidly with acidified potassium manganate(VII), KMnO4: 5H2O2(aq) + 2MnO4-(aq) + 6H+(aq) → 5O2(g) + 8H2O(l) + 2Mn2+(aq) You will determine the…
Answer this question and get it marked →Question 2 · 10 marks · Practical skills: calorimetry, recording data
You will now determine the concentration of a solution of hydrogen peroxide by a different method. Hydrogen peroxide decomposes slowly into water and oxygen at room temperature.…
Answer this question and get it marked →Question 3 · 16 marks · Practical skills: qualitative analysis, redox reactions of MnO2
FA 2 is KMnO4(aq). FA 5 is MnO2. (i) Transfer a 2 cm depth of FA 2, KMnO4, into a test-tube. Add the same volume of aqueous sodium hydroxide followed by a small spatula measure of…
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