A-LevelChemistryGroup 179701/12 · May/June 2020 · 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
B: The greater number of electrons in iodine leads to larger temporary dipole-induced dipole forces.
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