p-Block elementsHard

Question

Which inert gas has abnormal behaviour on liquefaction ?

Options

A.Xe
B.He
C.Ar
D.Kr

Solution

If Helium is compressed and liquified it forms He(I) liquid at 4.2 K. This liquid is a normal liquid like any other liquid. But if it is further cooled then He(II) is obtained at 2.2 K, which is known as super fluid, because it is a liquid with properties of gases. It climbs through the walls of the container & comes out. It has very high thermal conductivity and very low viscosity.

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