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AMU Medical AMU Solved Paper-2003

  • question_answer
    Consider reversible reaction,\[HCN(aq){{H}^{+}}(aq)+C{{N}^{-}}(aq)\] At equilibrium the addition of \[C{{N}^{-}}(aq)\] would

    A)  decrease the \[{{H}^{+}}(aq)\] ion concentration

    B)  reduce HCN (aq) concentration

    C)  increase the equilibrium constant

    D)  decrease the equilibrium constant

    Correct Answer: A

    Solution :

                     For the reaction                 \[HCN(aq){{H}^{+}}(aq)+C{{N}^{-}}(aq)\]                 \[{{K}_{c}}=\frac{[{{H}^{+}}]\,\,[C{{N}^{-}}]}{[HCN]}\] On the addition of \[C{{N}^{-}}(aq)\] at equilibrium, the \[[{{H}^{+}}](aq)\] decrease to maintain the equilibrium constant.


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