A-LevelChemistryElectrochemistryMay/June 2020Paper 1 Q51 Mark
In this question you should use changes in oxidation numbers to balance a chemical equation. The following reaction occurs when MnO2 is warmed with dilute H2SO4. a MnO2 + b H⁺ → c Mn²⁺ + d MnO4¯ + e H₂O What is the ratio of c : d in the correctly balanced equation?
A1:1
B1:2
C2:3
D3:2
✓ Correct Answer
The correct answer is D. This question tests the candidate's understanding of electrochemistry 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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