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J & K CET Engineering J and K - CET Engineering Solved Paper-2004

  • question_answer
    The equilibrium \[{{P}_{4}}(s)+6C{{l}_{2}}(g)\rightleftharpoons 4PC{{l}_{3}}(g)\]is attained by mixing equal moles of\[{{\text{P}}_{\text{4}}}\]and\[\text{C}{{\text{l}}_{\text{2}}}\]in an evacuated vessel. Then, at equilibrium

    A)  \[[C{{l}_{2}}]>[PC{{l}_{3}}]\]

    B) \[[C{{l}_{2}}]>[{{P}_{4}}]\]

    C)  \[[{{P}_{4}}]>[C{{l}_{2}}]\]

    D)  \[[PC{{l}_{3}}]>[{{P}_{4}}]\]

    Correct Answer: C

    Solution :

     For the reaction: \[{{P}_{4}}(s)+6C{{l}_{2}}(g)4PC{{l}_{3}}(g)\] \[\begin{align}   & \text{At}\,\,\text{t}=0\,\,\,\,\,\,\,\,1\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,1\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,0 \\  & \text{At}\,\text{eq}\text{.}\,\,\,\,\,\,\,\,\,\,(1-x)\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,(1-6x)\,\,\,\,\,\,4x \\  & \text{As}\,\,\,\,\,\,\,\,\,(1-x)>(1-6x) \\ \end{align}\] Hence, at equilibrium?\[[{{P}_{4}}]>[C{{l}_{2}}]\]


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