Four gases $P, Q, R$ and $S$ have almost same values of $b$ but their $a$ values ($a, b$ are van der Waals' constants) are in the order $Q < R < S < P$. At a particular temperature among the four gases,the most liquefiable one is

  • A
    $P$
  • B
    $Q$
  • C
    $R$
  • D
    $S$

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