Question

Among He, Ne, Ar, Kr and Xe, which gas is most easily liquefiable and why?

Answer 1

1. Among He, Ne, Ar, Kr, and Xe, xenon (Xe) is the most easily liquefiable gas.
2. This is because the liquefaction tendency of noble gases increases down the group.
3. The main reason is the increase in the size of the atom from He to Xe.
4. Larger atoms have stronger van der Waals forces between them.
5. Stronger van der Waals forces result in easier liquefaction.

Hence, Xe liquefies most easily due to its largest atomic size and strongest van der Waals forces among the given gases.