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JEE Main & Advanced AIEEE Solved Paper-2010

  • question_answer
      Consider the reaction: \[C{{l}_{2}}(aq)+{{H}_{2}}S(aq)\to S(s)+2{{H}^{+}}(aq)+2C{{l}^{-}}(aq)\] The rate equation for this reaction is Rate\[=k[C{{l}_{2}}][{{H}_{2}}S]\] Which of these mechanisms is/are consistent with this rate equation? (A) \[\begin{align}   & C{{l}_{2}}+{{H}_{2}}S\to {{H}^{+}}+C{{l}^{-}}+C{{l}^{-}}+H{{S}^{-}}(slow) \\  & Cl+H{{S}^{-}}\to {{H}^{+}}+C{{l}^{-}}+S(fast) \\ \end{align}\] (B) \[\begin{align}   & {{H}_{2}}S\Leftrightarrow {{H}^{+}}+H{{S}^{-}}(fast\text{ }equilibrium) \\  & C{{l}_{2}}+H{{S}^{-}}\to 2C{{l}^{-}}+{{H}^{+}}+S(slow) \\ \end{align}\]       AIEEE  Solved  Paper-2010

    A) A only                  

    B) B only   

    C)        Both A and B     

    D) Neither A nor B

    Correct Answer: A

    Solution :

    \[r=k[C{{l}_{2}}][{{H}_{2}}S]\] \[\therefore \]According to\[A\to r=k[{{H}_{2}}S][C{{l}_{2}}]\] \[\therefore \]According to\[B\to r=k[C{{l}_{2}}][HS]\] Or           \[{{K}_{eq}}=\frac{[{{H}^{+}}][HS]}{[{{H}_{2}}S]}\] \[[HS]={{K}_{eq}}\frac{[{{H}_{2}}S]}{{{H}^{+}}}\] \[r=k[C{{l}_{2}}]\,\,{{K}_{eq}}\,\frac{[{{H}_{2}}S]}{[{{H}^{+}}]}\] \[=K'\frac{[C{{l}_{2}}][{{H}_{2}}S]}{[{{H}^{+}}]}\] \[\therefore \] (A) Only


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