Boiling point increases down the zero group due to:
Correct answer: C. London forces
- A. H bonding
- B. Dipole forces
- C. London forces
- D. Debye forces
Explanation
The most important type of intermolecular force for noble gases is London dispersion forces. London dispersion forces are caused by the temporary uneven distribution of electrons in a molecule. This creates a temporary dipole, which can induce a dipole in another molecule. The attraction between these induced dipoles is a London dispersion force.The increase in size and molecular weight down the group increases the intermolecular forces and results in an increase in boiling point. This is because it takes more energy to break the intermolecular forces and turn the liquid into a gas.
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About Evaporation, Boiling Point and Vapour Pressure
Evaporation is the escape of higher-energy molecules from a liquid surface, while vapour pressure is the pressure exerted by vapour in equilibrium with that liquid. The topic distinguishes evaporation from boiling and relates both to temperature, intermolecular forces, surface area, atmospheric pressure and the boiling point.
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