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A-LevelChemistryChemical periodicity9701/12 · Feb/Mar 2020 · Q121 Mark

X and Y are oxides of different Period 3 elements. If one mole of X is added to water, the solution formed is neutralised by exactly one mole of Y. What could be the identities of X and Y?

AX: P4O10, Y: Al2O3

BX: SO3, Y: Al2O3

CX: P4O10, Y: Na2O

DX: SO3, Y: Na2O

✓ Correct answer

D: X: SO3, Y: Na2O

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About this question

Topic: Chemical periodicity, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, Feb/Mar 2020 Paper 1 Variant 2, question 12.

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