Question

The most favorable conditions to liquefy a gas are :

• A. high T and low P
• B. high T and high P
• C. low T and low P
• D. low T and high P

Answer 1

The correct option is D low T and high P

To liquefy the gas we have to decrease the volume of gas.

The ideal gas equation is given by,

$PV=nRT$

$\therefore V\propto T$

Hence to decrease the volume we have to decrease the temperature i.e. low T

Also, $V\propto \frac{1}{P}$

Hence to decrease the volume we have to increase the pressure i.e. high P

$\therefore$ The most favorable condition to liquefy a gas are low T and high P.

Option D is correct.