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The gas that liquefies first, when coole...

The gas that liquefies first, when cooled from 500 K to its critical temperature given in parenthesis is `"____________"`.

A

`NH_(3)(405.5 K)`

B

`CO_(2)(304.1K)`

C

`N_(2)(126.0 K)`

D

`O_(2)(154.3 K)`

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