A-LevelChemistryChemical periodicityMay/June 2021Paper 1 Q131 Mark
L and M are elements in Period 3 of the Periodic Table. • The oxide of L is a solid at room temperature. This oxide has a giant structure. • The chloride of L does not react with water. • Argon is the only element in Period 3 with a lower melting point than M. Which formula represents a compound of elements L and M?
AAl₂S₃
BMgS
CNaCl
DPCl₅
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The correct answer is C. 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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