Which of the following has strongest intermolecular forces of attraction ?
Correct answer: C. lodine (I2)
- A. Hydrogen (H2)
- B. Chlorine (Cl2)
- C. lodine (I2)
- D. Methane (CH4)
Explanation
Iodine molecules have the largest electron cloud among the listed substances, so they are most polarizable and experience the strongest London dispersion forces. Students may choose chlorine, option b, because it is also a halogen, but dispersion forces increase with molecular size and electron count.
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About Properties of Liquids
Liquid behavior depends on intermolecular forces, which produce surface tension, viscosity, capillary action and a definite volume without a fixed shape. The topic also covers vapor pressure, evaporation, boiling point and the effect of temperature and external pressure, while distinguishing evaporation at the surface from boiling throughout the liquid.
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