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The values of van der Waal's constant a ...

The values of van der Waal's constant a for the gases `O_2,N_2,NH_3` and `CH_4` is 1.360, 1.390, 4.170 and `2.253L^2` atm. `mol^(-2)` respectively. The gas which can most easily be liquefied is ?

A

`O_2`

B

`N_2`

C

`NH_3`

D

`CH_4`

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The correct Answer is:
C
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