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  4. Which one has the highest boiling point?

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Q. Which one has the highest boiling point?

JEE MainJEE Main 2013Classification of Elements and Periodicity in Properties

Solution:

As we move down the group of noble gases, molecular mass increases by which dipole produced for a moment and hence London forces increases from $He$ to $Xe$.
Therefore, more amount of energy is required to break these forces, thus boiling point also increases from $He$ and $Xe$.