A-LevelChemistryElectrochemistryOct/Nov 2017Paper 1 Q331 Mark
Hydrogen sulfide can be oxidised to form sulfur dioxide. 2H2S + 3O2 → 2SO2 + 2H2O Which statements are correct? 1 The oxidation number of sulfur increases by 6. 2 The oxidation number of oxygen increases by 2. 3 The oxidation number of hydrogen decreases.
A1, 2 and 3 are correct
B1 and 2 only are correct
C2 and 3 only are correct
D1 only is correct
✓ 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...
🔒
Unlock the Examiner's Answer
Sign up for free to reveal the correct answer, the official mark scheme breakdown, and the examiner trap analysis for this question.
Sign Up Free to Unlock →Join thousands of Cambridge students already using Oracle Prep