Question

Four gases $P,Q,R$ and $S$ have almost same values of ${}^{\prime }{b}^{\prime }$ but their ${}^{\prime }{a}^{\prime }$ values ($a,b$ are van der Waal's constants) are in the order $Q<R<S<P$. At a particular temperature among the four gases, the most easily liquefiable one is:

• A. $P$
• B. $Q$
• C. $R$
• D. $S$

Answer 1

Answer: (A)

$P$

Higher the value of $a$, more will be the tendency to get liquefy. Since, value of $a$ is highest for $P_1$ thus, $P$ is the most liquefiable gas among the given.