A test-tube containing HBr(g) and another separate test-tube containing HI(g) are both heated to the same temperature. Which set of observations could be seen?
- Atest-tube of HBr(g): a brown vapour appears; test-tube of HI(g): no change
- Btest-tube of HBr(g): a purple vapour appears; test-tube of HI(g): no change
- Ctest-tube of HBr(g): no change; test-tube of HI(g): a brown vapour appears
- Dtest-tube of HBr(g): no change; test-tube of HI(g): a purple vapour appears