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Why can O2 and N2 not be liquefied at room temperature by pressure?
ATheir Tc is far above room temperature
BTheir Tc is far below room temperature
CThey have very large dipole moments
DThey form strong hydrogen bonds
Answer & Solution
Correct answer: B. Their Tc is far below room temperature
Their critical temperatures lie far below 0 C, so cooling is needed before pressure can liquefy them.
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