Periodic Classification and Periodic Properties - Result Question 12

####9. Which one has the highest boiling point?

(a) $He$

(b) $Ne$

(c) $Kr$

(d) $Xe$

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Answer:

Correct Answer: 9. (d)

Solution:

  1. 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 $Xe$.



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