A-LevelChemistryNitrogen and sulfur9701/12 · May/June 2025 · 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
C: [catalyst: NO2, reagent: H2O]
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