Question

The ease of liquefaction of noble gases increases in the order
(a) He < Ne < Ar < Kr < Xe
(b) Xe < Kr < Ne < Ar < He
(c) Kr < Xe < He < Ne < Ar
(d) Ar < Kr < Xe < Ne < He

Answer 1

Hint: Air that has been chilled to extremely low temperatures (cryogenic temperatures) and condensed into a pale blue mobile liquid is known as liquid air. It's kept in specific containers to keep it from getting too warm at room temperature (vacuum insulated flasks are often used). Liquid air absorbs heat quickly before reverting to a gaseous form. It is frequently used for condensing and/or solidifying other compounds, as well as as an industrial supply of nitrogen, oxygen, argon, and other inert gases via an air separation process.

Complete answer:
The Joule–Thomson effect is a thermodynamic term that explains the temperature change of a real gas or liquid when it is pushed through a valve or porous plug while remaining isolated from the environment. The throttling process, often known as the Joule–Thomson process, is the name given to this procedure. All gases except hydrogen, helium, and neon cool when throttled through an orifice by the Joule–Thomson process at room temperature; these three gases have the same effect but at lower temperatures. The Joule–Thomson throttling process will warm most liquids, including hydraulic oils.
More the atomic size, more the intermolecular.(Van der waals forces) So less is the ease of liquefaction.
The balance between the kinetic energy of individual particles (molecules or atoms) and intermolecular forces determines the state of a material. The kinetic energy of a material is a function of its temperature, and intermolecular interactions strive to bring the particles closer.

Hence He > Ne > Ar > Kr > Xe option d is correct.

Note:
The phase transitions from solid to liquid (melting and condensation, respectively) are referred to as liquefaction in physics and chemistry. The melting point (sometimes referred to as the liquefaction point) is the temperature and pressure at which a solid transforms into a liquid. The process of condensing a gas to a liquid is frequently referred to as liquefaction of gases in commercial and industrial settings.