When helium gas is allowed to expand in to vaccum, heating effect is observed, The reaction for this is (Assume He as a non ideal gas)

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The inversion temperature of Helium is very low

The inversion temperature of Helium is very high

He has the lowest boiling point

$He$ is an inert gas

answer is C.

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Detailed Solution

Helium exhibits a heating effect in Joule-Thomson expansion due to its very lower inversion temperature of it. Other gases exhibit a cooling effect in Joule-Thomson expansion as work of expansion (during adiabatic expansion) is done at the expense of the internal energy.
The inversion temperature in thermodynamics is the temperature below which a non-ideal gas (all gases in reality) that is expanding at constant enthalpy will experience a temperature decrease, and above which will experience a temperature increase.

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