A-LevelChemistryNitrogen and sulfurMay/June 2019Paper 1 Q181 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 wet neutral soil. Which row is correct? higher percentage of nitrogen by mass effect on pH of soil A ammonium nitrate decrease B ammonium nitrate increase C ammonium sulfate decrease D ammonium sulfate increase
Ahigher percentage of nitrogen by mass: ammonium nitrate, effect on pH of soil: decrease
Bhigher percentage of nitrogen by mass: ammonium nitrate, effect on pH of soil: increase
Chigher percentage of nitrogen by mass: ammonium sulfate, effect on pH of soil: decrease
Dhigher percentage of nitrogen by mass: ammonium sulfate, effect on pH of soil: increase
✓ Correct Answer
The correct answer is A. 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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