A-LevelChemistryChemical bondingFeb/Mar 2016Paper 1 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
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The correct answer is B. This question tests the candidate's understanding of chemical bonding within the Chemistrysyllabus. The examiner's mark scheme requires...
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Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
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