A-LevelChemistryChemical periodicityMay/June 2012Paper 1 Q151 Mark
The period 4 elements gallium (Ga), germanium (Ge), arsenic (As) and selenium (Se) are the elements below aluminium, silicon, phosphorus and sulfur in the Periodic Table, a portion of which is shown below. [Figure 15.1] The properties of each period 4 element resemble those of the period 3 element directly above it. Which period 4 elements form oxides that dissolve in water to give an acid solution?
AAs and Se
BGa and Ge
CGa and Se
DSe only
✓ Correct Answer
The correct answer is A: As and Se
📋 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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