Given van der Waals constant for $NH_3$, $H_2$, $O_2$ and $CO_2$ are respectively 4.17, 0.244, 1.36 and 3.59,

Question

Given van der Waals constant for $NH_3$, $H_2$, $O_2$ and $CO_2$ are respectively 4.17, 0.244, 1.36 and 3.59, which one of the following gases is most easily liquefied?

Accepted Answer

Van der waal constant 'a' signifies intermolecular forces of attraction. Higher is the value of 'a', easier will be the liquefaction of gas. Since $NH_3$ has the highest value (4.17), it is most easily liquefied.

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