A-LevelChemistryChemical bonding9701/12 · Feb/Mar 2016 · Q161 Mark
Hydrogen chloride gas and hydrogen iodide gas have different thermal stabilities. The difference is due to a difference in the energies of some of the covalent bonds that are involved in the decomposition. Which row identifies the more stable of the two compounds, and gives the correct explanation?
Ahydrogen chloride, the Cl-Cl bond is stronger than the I-I bond
Bhydrogen chloride, the H-Cl bond is stronger than the H-I bond
Chydrogen iodide, the Cl-Cl bond is stronger than the I-I bond
Dhydrogen iodide, the H-Cl bond is stronger than the H-I bond
✓ Correct answer
B: hydrogen chloride, the H-Cl bond is stronger than the H-I bond
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