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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) ( 405.5K)`

B

`CO_(2) ( 304.1K ) `

C

`N_(2) ( 126.0 K ) `

D

`O_(2) ( 154.3K)`

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A
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