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JEE Main levelSingle correct optionDifficulty 2 of 3rg200

The critical temperature of water is $647 K$ and that of $CO X_{2}$ is $304 K$ . At $350 K$ , which of the following is true?

ABoth can be liquefied by applying pressure
BWater vapour can be liquefied by pressure but $CO X_{2}$ cannot
C $CO X_{2}$ can be liquefied by pressure but water vapour cannot
DNeither can be liquefied by applying pressure

Answer: B

Liquefaction by pressure alone requires

T

to be at or below

T_{c}

.

350 K

is below

647 K

(water can be liquefied) but above

304 K

(

CO X_{2}

cannot).

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