A-LevelChemistryChemical periodicityOct/Nov 2021Paper 1 Q121 Mark
A mixture of two Period 3 oxides are added to water. A solution forms with a pH of just below 7. What could be the constituents of the mixture?
AAl2O3 and MgO
BNa2O and MgO
CNa2O and P4O10
DSO3 and P4O10
✓ Correct Answer
The correct answer is C. This question tests the candidate's understanding of chemical periodicity within the Chemistrysyllabus. The examiner's mark scheme requires...
📋 Examiner Report & Trap Analysis
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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