A-LevelChemistryChemical periodicityFeb/Mar 2025Paper 1 Q201 Mark
J is either MgCl2 or AlCl3. K is either SiO2 or SiCl4. J(aq) add drops of aqueous sodium hydroxide -> white precipitate -> add an excess of aqueous sodium hydroxide -> precipitate dissolves K add water -> misty white fumes and a white precipitate in a solution with pH less than 7 Which row is correct?
AAlCl3 SiCl4
BAlCl3 SiO2
CMgCl2 SiCl4
DMgCl2 SiO2
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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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