The compressibility factor $(z)$ is lower for $NH_3$ and $CO_2$ gases than that of $N_2$ gas,because

  • A
    van der Waals constants $'a'$ of $CO_2$ and $NH_3$ are greater than that of $N_2$
  • B
    van der Waals constants $'a'$ of $CO_2$ and $NH_3$ are less than that of $N_2$
  • C
    $'a' (NH_3) > 'a' (N_2)$ but $'a' (CO_2) < 'a' (N_2)$
  • D
    $'a' (NH_3) < 'a' (N_2)$ but $'a' (CO_2) > 'a' (N_2)$

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