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DUMET Medical DUMET Medical Solved Paper-2009

  • question_answer
    The enthalpy of neutralisation of oxalic acid by a strong base is -25.4 kcal \[mo{{l}^{-1}}\]. The enthalpy of neutralisation of strong acid and strong base is -13.7 kcal \[equi{{v}^{-1}}\]. The enthalpy of dissociation of \[{{H}_{2}}{{C}_{2}}{{O}_{2}}\rightleftharpoons \,2{{H}^{+}}+{{C}_{2}}O_{4}^{2-}\] is

    A)  1.0 kcal \[mo{{l}^{-1}}\]   

    B)  2.0 kcal \[mo{{l}^{-1}}\]

    C)  18.55 kcal \[mo{{l}^{-1}}\]

    D)  11.7 kcal \[mo{{l}^{-1}}\]

    Correct Answer: B

    Solution :

    \[\Delta H=\Delta {{H}_{dissociation}}+\Delta {{H}_{neutalisation}}\] \[\therefore \,\,\,\Delta {{H}_{diss}}=\Delta H-\Delta {{H}_{neut}}=-2\times 13.7-(-25.4)\] \[=-27.5+25.4=-2.0\,\,kcal\,\,mo{{l}^{-1}}\]


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