A-LevelChemistryGroup 17May/June 2014Paper 1 Q181 Mark
A test-tube of HBr(g) and a test-tube of HI(g) are heated to the same temperature. Which combination of observations is possible? [Figure 18.1]
Atube of HBr(g): a brown vapour appears, tube of HI(g): no change is apparent
Btube of HBr(g): a purple vapour appears, tube of HI(g): no change is apparent
Ctube of HBr(g): no change is apparent, tube of HI(g): a brown vapour appears
Dtube of HBr(g): no change is apparent, tube of HI(g): a purple vapour appears
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The correct answer is D. This question tests the candidate's understanding of group 17 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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