A-LevelChemistryChemical bondingFeb/Mar 2017Paper 1 Q311 Mark
Nitrogen and phosphorus are both in Group 15 of the Periodic Table. Phosphorus forms a chloride with the formula PCl₅ but nitrogen does not form NCl₅. Which statements help to explain this? 1 Nitrogen's outer shell cannot contain more than eight electrons. 2 Nitrogen cannot have an oxidation state of +5. 3 Nitrogen is less electronegative than phosphorus.
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 D: 1 only is 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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