A-LevelChemistryChemical periodicity9701/12 · Oct/Nov 2012 · Q181 Mark

Elements X and Y are both in period three. When the chloride of X is added to water, it reacts and a solution of pH 2 is produced. When the chloride of Y is added to water, it dissolves and a solution of pH 7 is produced. Which statement explains these observations?

ABoth chlorides hydrolyse in water.

BX is phosphorus and Y is aluminium.

CX is silicon and Y is sodium.

DX is sodium and Y is phosphorus.

✓ Correct answer

C: X is silicon and Y is sodium.

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Topic: Chemical periodicity, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, Oct/Nov 2012 Paper 1 Variant 2, question 18.

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