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NEET Sample Paper NEET Sample Test Paper-79

  • question_answer
    The enthalpy change and entropy change of any chemical reaction are \[-11.7\times {{10}^{3}}\,J\,mo{{l}^{-\,1}}\] and \[-105\,J\,mo{{l}^{-\,1}}\,\,{{K}^{-\,1}}\] respectively. What type of reaction is it? (Hint, \[\operatorname{temperature} = 25{}^\circ  C\])

    A)  reaction is spontaneous

    B)  reaction is non-spontaneous

    C)  reaction is instantaneous                                                 

    D)  None of these

    Correct Answer: B

    Solution :

    \[\Delta G=\Delta H\,-T\Delta S\] \[=\,\,-11.7\times 1{{0}^{3}}-298\times \left( -105 \right)\,\,=\,\,19.590\,\,kJ\] Since, Gibbs free energy change is positive hence, it is non-spontaneous reaction.


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