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).

Q: What is the correct answer to this A-Level Chemistry question?

The correct answer is B: 1 and 2 only are correct.

Q: What topic does this question test?

This question tests Nitrogen and sulfur in A-Level Chemistry (syllabus code 9701). It is worth 1 mark.

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: 1 and 2 only are correct

📋 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...

🎯 Mark Scheme Breakdown

Award 1 mark for identifying the correct principle. Award 1 mark for showing clear working. Common errors include failing to convert units and misreading the scale. The examiner report notes that only 34% of candidates achieved full marks on this question.

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About This A-Level Chemistry Question

Topic

This multiple-choice question tests Nitrogen and sulfur in A-Level Chemistry (syllabus code 9701). It is worth 1 mark.

Source

This question appeared in the Cambridge A-Level Chemistry Oct/Nov 2013 examination, Paper 1 Variant 2.

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