A-LevelChemistryGroup 2Oct/Nov 2021Paper 1 Q131 Mark
Which statement about the compounds of the Group 2 metals is correct?
ABarium carbonate is less thermally stable than strontium carbonate.
BBarium sulfate is less soluble than magnesium sulfate.
CCalcium hydroxide is less soluble than magnesium hydroxide.
DCalcium nitrate is more thermally stable than strontium nitrate.
✓ Correct Answer
The correct answer is B: Barium sulfate is less soluble than magnesium sulfate.
📋 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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