The pressure and temperature of a gas ar...

The pressure and temperature of a gas are P and T respectively. If the critcal pressure and critical temperature of the gas be `P_(c) and T_(c)` respectively, then liquefacction will be possible when-

`P lt P_(c), T lt T_(c)`

`P=P_(c),T=T_(c)`

`P=P_(c),T gt T_(c)`

`P gt P_(c), T=T_(c)`

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B, D

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