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CMC Medical CMC-Medical Ludhiana Solved Paper-2008

  • question_answer
    For reaction, \[2NOCl(g)\rightleftharpoons 2NO(g)+C{{l}_{2}}(g),\]\[{{K}_{c}}\]at \[427{}^\circ C\] is \[3\times {{10}^{-6}}L\,\,\text{mo}{{\text{l}}^{-1}}\]. The value of \[{{K}_{p}}\]is nearly

    A)  \[7.5\times {{10}^{-5}}\]                             

    B)  \[2.5\times {{10}^{-5}}\]

    C)  \[2.5\times {{10}^{-4}}\]                             

    D)  \[1.72\times {{10}^{-4}}\]

    Correct Answer: D

    Solution :

                    \[2NOCl(g)\rightleftharpoons 2NO(g)+C{{l}_{2}}(g)\] \[{{K}_{c}}=3\times {{10}^{-6}}L\,mo{{l}^{-1}},\] \[T=427+273=700\,K\] \[{{K}_{p}}={{K}_{c}}{{(RT)}^{\Delta n}}\] \[\Delta n=3-2=1\] \[{{K}_{p}}={{K}_{c}}RT\]              \[=3\times {{10}^{-6}}\times 0.0821\times 700\] \[=172.4\times {{10}^{-6}}=1.72\times {{10}^{-4}}\]


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