A-LevelChemistryChemical periodicityFeb/Mar 2018Paper 1 Q141 Mark
X, Y and Z are three elements in the third period. • X reacts with chlorine to give a liquid product. • Y reacts with chlorine to give a solid product that dissolves in water to give a solution of pH 7. • Z reacts with chlorine to give a solid product that dissolves in water to give a solution of pH 6. Which elements are good conductors of electricity?
AX and Y
BY and Z
CY only
DZ only
✓ Correct Answer
The correct answer is B: Y and Z
📋 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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