A-LevelChemistryElectrochemistryMay/June 2018Paper 1 Q81 Mark
Sulfur reacts with concentrated nitric acid in a redox reaction. S + 4HNO3 → SO2 + 4NO2 + 2H2O What are the changes in oxidation number of sulfur and of nitrogen in this reaction? [Table showing changes in oxidation number for sulfur and nitrogen]
A+2
-3
B+2
-1
C+4
-3
D+4
-1
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The correct answer is D. This question tests the candidate's understanding of electrochemistry within the Chemistrysyllabus. The examiner's mark scheme requires...
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