A-LevelChemistryGroup 17May/June 2020Paper 1 Q181 Mark
A test-tube of HBr(g) and a separate test-tube of HI(g) are heated to the same temperature. Which combination of observations is possible? test-tube of HBr(g) test-tube of HI(g) a brown vapour appears no change a purple vapour appears no change no change a brown vapour appears no change a purple vapour appears
Abrown vapour appears, no change
Bpurple vapour appears, no change
Cno change, a brown vapour appears
Dno change, 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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