In a \[500ml\] capacity vessel \[CO\] and \[C{{l}_{2}}\] are mixed to form \[COC{{l}_{2}}\]. At equilibrium, it contains 0.2 moles of \[COC{{l}_{2}}\] and 0.1 mole of each of \[CO\] and \[C{{O}_{2}}\]. The equilibrium constant \[{{K}_{c}}\] for the reaction \[CO+C{{l}_{2}}\] ⇌\[COC{{l}_{2}}\] is [CBSE PMT 1998]

• A.                 5             
• B.                 10
• C.                 15          
• D.                 20