London dispersion forces are the only forces present among?
Correct answer: A. Atoms of helium in gaseous state at high temperature
- A. Atoms of helium in gaseous state at high temperature
- B. Molecules of water
- C. Molecules of NH3
- D. Molecules of HCl gas
Explanation
Option A is correct because helium atoms are non-polar and only exhibit London dispersion forces. These forces arise due to temporary fluctuations in the electron cloud, making them the sole intermolecular force present in helium gas. Option B is incorrect because water molecules exhibit hydrogen bonding, a much stronger force than London dispersion forces. Option C is incorrect because ammonia molecules also exhibit hydrogen bonding. Option D is incorrect because, in addition to London dispersion forces, HCl molecules experience dipole-dipole interactions due to their polarity.
This question appeared on the UHS MDCAT 2016 paper, which you can sit online with every answer explained.
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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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