A-LevelChemistryChemical periodicityFeb/Mar 2023Paper 1 Q191 Mark
Two Period 3 elements, X and Y, burn separately in oxygen to form solid oxides. The oxide of X is insoluble in water. The oxide of Y dissolves in water to form a solution which dissolves the oxide of X. What could X and Y be? [Table with columns "X", "Y"]
Aaluminium, sodium
Bmagnesium, sodium
Csilicon, phosphorus
Dsilicon, sulfur
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The correct answer is A. 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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