A-LevelChemistryGroup 179701/12 · May/June 2020 · 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

✓ Correct answer

D: no change, a purple vapour appears

Oracle Prep sorts past-paper questions by topic, so you can drill Group 17 and see which topics are most likely to come up next.

Topic: Group 17, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, May/June 2020 Paper 1 Variant 2, question 18.

Questions and mark schemes are from past examination papers and remain the copyright of the exam board. How Oracle Prep builds its content