CAIE A-Level Chemistry AS 11.2.3 Thermal Stabilities of the Hydrogen Halides Questions
Practise ranking hydrogen halide thermal stability and explaining the trend through H–X covalent bond strength.
- Syllabus
- 2028–2030
- Course
- Chemistry 9701
- Level
- AS
Exam points
- state that thermal stability decreases from HCl to HBr to HI down Group 17
- link the trend to increasing halogen size, longer H–X bonds and decreasing bond strength
- use bond-energy data to identify which hydrogen halide decomposes most readily on heating
CAIE A-Level Chemistry AS 11.2.3 Thermal Stabilities of the Hydrogen Halides Questions question 1
[Maximum number: 1]
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
D
All question bank results loaded