A-LevelChemistryGroup 179701/12 · May/June 2018 · Q141 Mark
In this question, X represents an atom of chlorine, bromine or iodine. Which explanation for the variation in volatility down Group 17 is correct?
AInstantaneous dipole-induced dipole forces between molecules become stronger.
BPermanent dipole-permanent dipole forces between molecules become stronger.
CThe bond energy of the X2 molecules decreases.
DThe first ionisation energy X(g) → X⁺(g) + e⁻ decreases.
✓ Correct answer
A: Instantaneous dipole-induced dipole forces between molecules become stronger.
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