In a vessel,the following two systems are in simultaneous equilibrium: $PCl_{5(g)} \rightleftharpoons PCl_{3(g)} + Cl_{2(g)}$ and $COCl_{2(g)} \rightleftharpoons CO_{(g)} + Cl_{2(g)}$. If some $CO$ is added to the vessel at constant volume,then at the new equilibrium:

  • A
    $PCl_5$ concentration increases
  • B
    $PCl_3$ concentration remains unchanged
  • C
    $PCl_5$ concentration decreases
  • D
    $Cl_2$ concentration increases

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