A-LevelChemistryChemical periodicityFeb/Mar 2020Paper 1 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
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The correct answer is D. This question tests the candidate's understanding of chemical periodicity within the Chemistrysyllabus. The examiner's mark scheme requires...
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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...
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