A-LevelChemistryChemical periodicity9701/12 · May/June 2012 · 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?

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AAs and Se

BGa and Ge

CGa and Se

DSe only

✓ Correct answer

A: As and Se

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Topic: Chemical periodicity, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, May/June 2012 Paper 1 Variant 2, question 15.

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