A-LevelChemistryGroup 179701/12 · May/June 2014 · 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]

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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

✓ Correct answer

D: tube of HBr(g): no change is apparent, tube of HI(g): a purple vapour appears

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Topic: Group 17, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, May/June 2014 Paper 1 Variant 2, question 18.

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