A-LevelChemistryGroup 17May/June 2020Paper 1 Q141 Mark
Which statement explains why iodine is less volatile than chlorine?
AChlorine is more electronegative than iodine and so has more repulsion between its molecules.
BThe greater number of electrons in iodine leads to larger temporary dipole-induced dipole forces.
CThe I-I bond energy is smaller than the Cl-Cl bond energy.
DThe iodine molecules have stronger permanent dipole-permanent dipole forces.
✓ Correct Answer
The correct answer is B. This question tests the candidate's understanding of group 17 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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