A-LevelChemistryEquilibriaFeb/Mar 2016Paper 1 Q171 Mark

Ammonium sulfate, (NH₄)₂SO₄, and ammonium nitrate, NH₄NO₃, are used as fertilisers. These salts have different percentages by mass of nitrogen. They have the same effect as each other on the pH of neutral soil. Which row is correct?

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

The correct answer is A: ammonium nitrate, decrease.

Q: What topic does this question test?

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

Aammonium nitrate, decrease

Bammonium nitrate, increase

Cammonium sulfate, decrease

Dammonium sulfate, increase

✓ Correct Answer

The correct answer is A: ammonium nitrate, decrease

📋 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 Equilibria in A-Level Chemistry (syllabus code 9701). It is worth 1 mark.

Source

This question appeared in the Cambridge A-Level Chemistry Feb/Mar 2016 examination, Paper 1 Variant 2.

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