For two gases, X and Y, the critical temperature (Tc) of X is 190 K and Y is 304 K. Which of the following statements is TRUE?
Correct: B
Critical temperature (Tc) is the temperature above which a gas cannot be liquefied, no matter how much pressure is applied. A higher Tc indicates stronger intermolecular attractive forces, meaning the gas is more easily liquefiable. Since Tc(Y) (304 K) is higher than Tc(X) (190 K), Gas Y has stronger intermolecular forces and is more easily liquefiable than Gas X. Therefore, option B is correct. Stronger intermolecular forces are represented by a larger 'a' value in the Van der Waals equation, so Gas Y would have a higher 'a' constant.