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NEET levelSingle correct optionDifficulty 1 of 3rg025

Hydrogen and helium get warmer when allowed to expand through a porous plug at room temperature because

Atheir inversion temperatures are below room temperature
Btheir inversion temperatures are above room temperature
Cthey have very large $a$ values
Dthey are monoatomic

Answer: A

A gas cools on Joule-Thomson expansion only below its inversion temperature. For

H X_{2}

(

T_{i} \approx 193 K

) and

He

(

T_{i} \approx 40 K

) room temperature is above

T_{i}

, so they warm up and must be pre-cooled before liquefaction.

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