A-LevelChemistryChemical periodicityOct/Nov 2020Paper 1 Q191 Mark
Compound X is the oxide of a Period 3 element. Compound X reacts with water to give an acidic solution. A solution is prepared by reacting 0.100 g of compound X with an excess of water. This solution is neutralised by exactly 25.0 cm³ of 0.100 mol dm⁻³ sodium hydroxide solution. What could be the identity of compound X?
AAl₂O₃
BMgO
CP₄O₁₀
DSO₃
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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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