A-LevelChemistryGroup 2Feb/Mar 2024Paper 1 Q191 Mark
Separate samples of magnesium and calcium are added to an excess of dilute sulfuric acid. The observations are summarised in the table. metal: magnesium, observations: vigorous reaction, bubbles of gas produced, magnesium completely dissolves metal: calcium, observations: vigorous reaction initially, bubbles of gas produced, reaction soon stops and leaves most of the calcium unreacted Which statement explains the difference in these observations?
ACalcium is a better oxidising agent than magnesium.
BCalcium is a better reducing agent than magnesium.
CMagnesium is a more reactive metal with all dilute acids than calcium.
DMagnesium sulfate is more soluble than calcium sulfate.
✓ Correct Answer
The correct answer is D: Magnesium sulfate is more soluble than calcium 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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