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NEET NEET SOLVED PAPER 2017

  • question_answer
    For a given reaction,\[\Delta =35.5\,kJ\,mo{{l}^{-1}}\] and \[\Delta S=83.6\,J{{K}^{-1}}\,mo{{l}^{-1}}.\]The reaction is spontaneous at : (Assume that\[\Delta H\]and\[\Delta S\] do not vary with temperature)                                                                     

    A)  T > 298 K            

    B) T < 425 K

    C) T > 425 K                            

    D)  All temperatures

    Correct Answer: C

    Solution :

    \[\because \] \[\Delta G=\Delta H-T\Delta S\] For a reaction to be spontaneous, \[\Delta G=-ve\] i.e.,        \[\Delta H<T\Delta S\] \[\therefore \]  \[T>\frac{\Delta  }{\Delta S}=\frac{35.5\times {{10}^{3}}J}{83.6\,J{{K}^{-1}}}\] i.e., T > 425 K


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