The Freezing Point of Helium Is -270°C

question 99

Multiple Choice

The freezing point of helium is -270°C.The freezing point of xenon is -112°C.Both of these are in the noble gas family.Which of the following statements is supported by these data?

• A)Helium and xenon form highly polar molecules.
• B)As the molecular weight of the noble gas increases,the freezing point decreases.
• C)The London dispersion forces between the helium molecules are greater than the London dispersion between the xenon molecules.
• D)The London dispersion forces between the helium molecules are less than the London dispersion forces between the xenon molecules.
• E)None of these.

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