The decomposition of \[{{N}_{2}}{{O}_{4}}\] to \[N{{O}_{2}}\] is carried out at \[280K\] in chloroform. When equilibrium has been established, 0.2 mol of \[{{N}_{2}}{{O}_{4}}\] and \[2\times {{10}^{-3}}\] mol of \[N{{O}_{2}}\] are present in 2 litre solution. The equilibrium constant for reaction \[{{N}_{2}}{{O}_{4}}\] ⇌ \[2N{{O}_{2}}\] is [AIIMS 1984]

• A.                 \[1\times {{10}^{-2}}\]  
• B.                 \[2\times {{10}^{-3}}\]
• C.                 \[1\times {{10}^{-5}}\]  
• D.                 \[2\times {{10}^{-5}}\]