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(B) $1$. The average kinetic energy per mole of an ideal gas is given by the formula $KE_{avg} = \frac{3}{2} RT$.$2$. Since the temperature $T$ is con

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Average kinetic energy per mole of gas $X$ is highest.

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(B) $1$. The average kinetic energy per mole of an ideal gas is given by the formula $KE_{avg} = \frac{3}{2} RT$.$2$. Since the temperature $T$ is constant at $400 \ K$ for all gases in the mixture,the average kinetic energy per mole for all gases $(X, Y, Z)$ must be identical $(KE_{avg} = \frac{3}{2} R(400))$.$3$. Therefore,the statement that the average kinetic energy per mole of gas $X$ is the highest is physically impossible,as it must be equal to the others.$4$. Option $A$ is possible depending on the molar masses.$5$. Option $C$ is a property of ideal gases (they cannot be liquefied).$6$. Option $D$ is correct based on the ideal gas law $P_X = \frac{n_X RT}{V}$.

Equal masses of three non-reacting different ideal gases $X, Y$ and $Z$ are mixed in a sealed rigid container. If the temperature of the system remains constant at $400 \ K$,which of the following statements about gas $X$ can never be correct?

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