At constant temperature and pressure,the change in volume when $80\%\, 100\, mL$ of phosgene $(COCl_2)$ decomposes into $CO$ and $Cl_2$ is an increase of ............... $mL$.

  • A
    $80$
  • B
    $60$
  • C
    $40$
  • D
    No change

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