Given below are the critical temperatures of some of the gases: Gas Critical temperature (K) He 5.2 CH4 190 CO2 304.2 NH3 405.5 The gas showing the least adsorption on a definite amount of charcoal is:

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He Explanation: The critical temperature of a gas indicates its ease of liquefaction. The higher the critical temperature of a gas, the stronger the intermolecular attractive forces and thus the ease of liquefaction.

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