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The value of van der waal's constant 'a'...

The value of van der waal's constant 'a' for gases `O_(2),N_(2),NH_(3)andCH_(4)` are x, y, z and c respectively, where `zgtcgtygtx.` The gas which can most easily be liquified 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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