(A) The critical temperature $(T_c)$ is the temperature above which a gas cannot be liquefied by pressure alone. Therefore,it is possible to compress

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It is not possible to compress a gas at a temperature lower than $T_c$.

(A) The critical temperature $(T_c)$ is the temperature above which a gas cannot be liquefied by pressure alone. Therefore,it is possible to compress and liquefy a gas at temperatures below $T_c$. Statement $A$ is incorrect because it claims it is impossible to compress a gas below $T_c$,whereas it is actually the condition required for liquefaction.

Class 11 Chemistry States of Matter Critical state and Liquefaction of gases

Difficult

Which of the following statements is incorrect?

A
It is not possible to compress a gas at a temperature lower than $T_c$.
B
At temperatures lower than $T_c$,molecules are close enough that attractive forces become effective,leading to condensation.
C
Condensation is not possible above $T_c$.
D
At temperatures higher than $T_c$,the kinetic energy of gas molecules is high,and the attraction between them decreases.