A-LevelChemistryChemical periodicity9701/12 · May/June 2011 · Q141 Mark

The highest oxides of the elements sodium to chlorine are separately added to water. Which diagram best represents the pH of the resulting mixtures? [Figure 14.1]

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A[Diagram A: pH decreasing from Na2O to Cl2O7, with plateaus]

B[Diagram B: pH decreasing from Na2O to Cl2O7, with a steep drop after MgO]

C[Diagram C: pH increasing from Na2O to Cl2O7]

D[Diagram D: pH mostly constant low for most, then increasing for Cl2O7]

✓ Correct answer

B: [Diagram B: pH decreasing from Na2O to Cl2O7, with a steep drop after MgO]

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Topic: Chemical periodicity, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, May/June 2011 Paper 1 Variant 2, question 14.

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