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JCECE Medical JCECE Medical Solved Paper-2012

  • question_answer
    Which of the following pairs of a chemical reaction is certain to result in a spontaneous reaction?

    A)  Exothermic and decreasing disorder

    B)  Endothermic and increasing disorder

    C)  Exothermic and increasing disorder

    D)  Endothermic and decreasing disorder

    Correct Answer: B

    Solution :

     For a spontaneous reaction, \[\Delta G=-ve.\] From Gibbs -Helmholtz equation \[\Delta G=\Delta H-T\Delta S\] \[\Delta G=-ve,\]when \[\Delta H=-ve\]and \[\Delta S=+\,ve\] For\[\Delta H=-ve,\] reaction Should be exothermic and \[\Delta S=+ve\]for increase in disorder.


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