A-LevelChemistryNitrogen and sulfurOct/Nov 2013Paper 1 Q361 Mark
Sulfur dioxide and sulfites are used in food preservation. Why are they used for this purpose? 1. They are reducing agents which slow down the oxidation of food. 2. They inhibit the growth of aerobic bacteria. 3. They react with NO2(g) converting it to NO(g).
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 B. 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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