Question

The van der Waals' constants for four gases $P,Q,R$ and $S$ are $4.17,3.59,6.71$ and $3.8$ atm $L^{2}mo{l}^{-2}$ Therefore, the ascending order of their liquification is

• A. $R<P<S<Q$
• B. $Q<S<R<P$
• C. $Q<S<P<R$
• D. $R<P<Q<S$

Answer 1

Answer: (C)

As the value of van der Waal's constant increases, ease of liquification of a gas also increases. The ascending order of van der Waal's constants for gases $P,Q,R,S$ is as
$\underset{(Q)}{3.59}<\underset{(S)}{3.8}<\underset{(P)}{4.17}<\underset{(R)}{6.71}$
Thus, the order of ease of liquification is $Q<S<P<R$