Which of the following are true?

• A

  Higher the value of a, weaker is intermolecular force of attraction

• B

  At low pressure, $\mathrm{Z}=1−\frac{\mathrm{a}}{{\mathrm{V}}_{\mathrm{m}}\mathrm{RT}}$ for ideal gas

• C

  ${\left(\frac{{\mathrm{V}}_1}{{\mathrm{V}}_2}=\left(\frac{{\mathrm{T}}_2}{{\mathrm{T}}_1}\right)\right)}^{3/2}$ for reversibre adiabaric expansion

• D

  A gas can be liquefied below critical temperature high pressure