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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?

$O_2$
$H_2$
$NH_3$
$CO_2$
Explanation:

• van der waal constant ‘a’, signifies intermolecular forces of attraction.
• Higher is the value of ‘a’, easier will be the liquefaction of gas.
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