A-LevelChemistryGroup 179701/12 · May/June 2016 · Q191 Mark
Fluorine and iodine are Group 17 elements. Their melting points are different due to differing strengths of van der Waals' forces between molecules. Which row is correct? melting point strength of van der Waals' forces between molecules F₂ > I₂ F₂ > I₂ F₂ > I₂ F₂ < I₂ F₂ < I₂ F₂ < I₂ F₂ < I₂ F₂ > I₂
AF₂ > I₂ F₂ > I₂
BF₂ > I₂ F₂ < I₂
CF₂ < I₂ F₂ < I₂
DF₂ < I₂ F₂ > I₂
✓ Correct answer
C: F₂ < I₂ F₂ < I₂
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