MEDIUMMCQ SINGLEIChO (Chemistry Olympiad)Physical ChemistryGaseous stateLiquefaction of Gases
Gases possess characteristic critical temperature which depends upon the magnitude of intermolecular forces between the gas particles. Critical temperatures of ammonia and carbon dioxide are 405.5 K and 304.10 K respectively. Which of these gases will liquefy first when you start cooling from 500 K to their critical temperature?
A.NH3✓ Correct
B.CO2
C.Both NH3 and CO2 liquefy simultaneously
D.None of the above
Explanation
Ammonia will liquefy first because its critical temperature will be reached first, Liquification of CO2 will require more cooling.