Question

Arrange the van der Waals constant a for the gases

I	$C_{6}H_{6\left(g\right)}$	A.	0.217
II	$C_{6}H_{5}CH_{3\left(g\right)}$	B.	5.464
III	$Ne_{\left(g\right)}$	C.	18.000
IV	$H_{2}O_{\left(g\right)}$	D.	24.060

• A. $(I) - (A), (II) - (D), (III) - (C), (IV) - (B)$
• B. $(I) - (D), (II) - (A), (III) - (B), (IV) - (C)$
• C. $(I) - (C), (II) - (D), (III) - (A), (IV) - (B)$
• D. $(I) - (B), (II) - (C), (III) - (A), (IV) - (D)$

Answer 1

Answer: (C)

a (i.e., the magnitude of attractive forces) increases with the size of the molecules. Thus, inert gases will have minimum value followed by $H_{2}O,C_{6}H_{6}$ and $C_{6}H_{5}CH_{3}$.