Gases possess characteristic critical temperature which depends upon the magnitude of intermolecular forces between the particles. Following are the critical temperatures of some gases.
Gases H₂ He O₂ N₂
Critical temperature in Kelvin 33.2 5.3 154.3 126
From the above what would be the order of liquefaction of these gases? Start writing the order from the gas liquefizing first

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$H_{2}, He, O_{2}, N_{2}$

$O_{2}, N_{2}, H_{2}, He$

$N_{2}, O_{2}, He, H_{2}$

$He, O_{2}, H_{2}, N_{2}$

answer is D.

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Detailed Solution

Higher the critical temperature, more easily is the gas liquefied.
Hence, order of liquefaction starting with the gas liquefying first will be O₂, N₂, H₂, He.

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Gases	H₂	He	O₂	N₂
Critical temperature in Kelvin	33.2	5.3	154.3	126