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The van der Waals' constant 'a' for the ...

The van der Waals' constant 'a' for the gases `O_(2), N_(2), NH_(3) "and " CH_(4)` are 1.36, 1.39, 4.17 and 2.253 respectively, the gas which can be most easily liquefied is :

A

`O_(2)`

B

`N_(2)`

C

`CH_(4)`

D

`NH_(2)`

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The correct Answer is:
D
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