Given van der Waals constant for , , and are respectively 4.17, 0.244, 1.36 and 3.59, which one of the following gases is most easily liquefied?
Van der waal constant 'a' signifies intermolecular forces of attraction. Higher is the value of 'a', easier will be the liquefaction of gas. Since has the highest value (4.17), it is most easily liquefied.
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