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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?
Explanation
Larger 'a' means stronger attractions and easier liquefaction.
Detailed Solution
van der Waals constant 'a' signifies intermolecular forces of attraction.
Higher the value of 'a', easier the liquefaction of the gas.
$NH_3$ has the highest 'a' (4.17), so it is most easily liquefied.