A-LevelChemistryChemical periodicityOct/Nov 2016Paper 1 Q141 Mark
Elements Y and Z are both in Period 3. When the chloride of Y is added to water, it reacts and a solution of pH 2 is produced. When the chloride of Z is added to water, it dissolves and a solution of pH 7 is produced. Which statement explains these observations?
ABoth chlorides hydrolyse in water.
BY is magnesium and Z is sodium.
CY is phosphorus and Z is aluminium.
DY is silicon and Z is sodium.
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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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