The compressibility factor $(Z)$ of one mole of a van der Waals' gas of negligible '$a$' value is

  • A
    $1$
  • B
    $\frac{b p}{R T}$
  • C
    $1+\frac{b p}{R T}$
  • D
    $1-\frac{b p}{R T}$

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