Why do real gases deviate from ideal behavior in the $pV$ vs $p$ and $p$ vs $V$ graphs at specific temperatures?

  • A
    Due to the absence of intermolecular forces.
  • B
    Due to the finite size of gas molecules and intermolecular interactions.
  • C
    Because gas molecules are point masses.
  • D
    Because collisions are perfectly elastic at all temperatures.

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For $1 \ mol$ of gas,the plot of $pV$ vs $p$ is shown below. $p$ is the pressure and $V$ is the volume of the gas. What is the value of compressibility factor at point $A$?

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