Gases possess characteristic critical temperature

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 data what would be the order of liquefaction of these gases?

Start writing the order from the gas liquefying first

(i) H2, He, O2, N2

(ii) He, O2, H2, N2

(iii) N2, O2, He, H2

(iv) O2, N2, H2, He