A-LevelChemistryNitrogen and sulfurMay/June 2025Paper 1 Q241 Mark
Sulfur dioxide in the atmosphere can form acid rain. This occurs in two steps. 1 oxidation of SO2 to SO3 2 formation of dilute H2SO4 Which row identifies the atmospheric catalyst for step 1 and the reagent for step 2?
A[catalyst: O2, reagent: H2O]
B[catalyst: O2, reagent: O2]
C[catalyst: NO2, reagent: H2O]
D[catalyst: NO2, reagent: O2]
✓ Correct Answer
The correct answer is C. This question tests the candidate's understanding of nitrogen and sulfur 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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