A-LevelChemistryNitrogen and sulfurOct/Nov 2011Paper 1 Q141 Mark
Nitrogenous fertilisers are used extensively in modern farming. If rainwater washes excess fertiliser into a nearby lake, a process called eutrophication may occur. Three of the stages of eutrophication are described below. P Water plants growing on the lake bed die due to lack of sunlight. Q An excessive growth of algae occurs. R Excessive bacterial activity causes a reduction in oxygen levels. In which order do these three stages occur?
AP → Q → R
BP → R → Q
CQ → P → R
DQ → R → P
✓ Correct Answer
The correct answer is C. 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...
🔒
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