Given van der Waals' constant for NH3, H...

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)`

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`*` van der waal constant 'a', signifies intermolecular forces of attraction.
`*` Higher is the value of 'a', eaiser will be the liquefaction of gas .

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