At Boyle's temperature,the compressibility factor $Z$ for a real gas is:

In the given $pV \to V$ graph for gases at constant temperature,what kind of deviation will be observed for $H_2, He, CO, CH_4$?

Which of the following represents the $Van \ der \ Waals$ equation for $n$ moles of a real gas?

Under which one of the following conditions do real gases approach the ideal gas behaviour?

Which of the following gas samples shows real gas behavior?

Given van der Waals constant $a$ for $NH_{3}$,$H_{2}$,$O_{2}$ and $CO_{2}$ are respectively $4.17$,$0.244$,$1.36$ and $3.59$,which one of the following gases is most easily liquefied?