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NEET Sample Paper NEET Sample Test Paper-89

  • question_answer
    Enthalpy and entropy change for a chemical reaction are \[-2.5\times {{10}^{3}}\]cals and 7.4 cals \[{{\deg }^{-1}}\] respectively. At \[25{}^\circ C\] the reaction is:

    A) Reversible         

    B)        Irreversible

    C) Spontaneous     

    D)        Non spontaneous

    Correct Answer: C

    Solution :

    [c] \[\Delta H=-2.5\times {{10}^{3}}cal\] \[\Delta S=7.4\,cal\] \[\Delta G=\Delta H-T\Delta S\] \[=-2.5\times {{10}^{3}}-298\times 7.4=-4705.2\,Cal.\] \[\Delta G=-\] ive; so process is spontaneous \[\Delta G=0,\] Equilibrium \[\Delta G=+\] ive; Non-spontaneous


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