JEE Main · 2015 · 04 Apr 2015 · Offline · Chemical Bonding and Molecular Structure

Which one has the highest boiling point?

(A)Ne
(B)Kr
(C)Xe✓ Correct
(D)He

Answer: (C)

Solution

Noble gases are held together only by weak London dispersion forces, and those forces strengthen as the atoms grow larger and more polarisable. Boiling point therefore rises down the group,

He < Ne < Kr < Xe

. Of the choices offered, xenon is the biggest atom, so it boils highest.

JEE Main · 2015 · 04 Apr 2015 · Offline · Single correct option

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