A-LevelChemistryChemical periodicityOct/Nov 2021Paper 1 Q171 Mark
X is the ion of a metal which burns with a red flame. Y is an ion that reacts with concentrated H2SO4 to produce H2S. What could be the formula of a compound containing X and Y?
ABaBr2
BBaI2
CSrBr2
DSrI2
✓ Correct Answer
The correct answer is D. 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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