Vander Waal’s constants for three different gases are given:

Gas	a (atm L² $mo{l}^{-2}$)	b (L $mo{l}^{-1}$)
X	3.0	0.025
Y	10.0	0.030
Z	6.0	0.035

Which is correct?

Most ideal = less a, b = x

Minimum molecular volume = less b = x

Maximum molecular volume = more b = z

Maximum critical temp = more a/b = y