Question

It's easier to liquify oxygen than hydrogen because:
a) oxygen has a higher critical temperature and lower inversion temperature than hydrogen
b) oxygen has a lower critical temperature and higher inversion temperature than hydrogen
c) oxygen has a higher critical temperature and higher inversion temperature than hydrogen
d) the critical temperature and inversion temperature of oxygen is very low

Answer 1

It is easier to liquefy oxygen than hydrogen because oxygen has a higher critical temperature and a higher inversion temperature than hydrogen. Oxygen liquefies at temperature −182.9oC−182.9oC whereas hydrogen liquefies at temperature −242.7oC−242.7oC.
therefore,
option (d) is correct.