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NEET Sample Paper NEET Sample Test Paper-57

  • question_answer
    A schematic plot of /n \[{{K}_{eq}}\]versus inverse of temperature for a reaction is shown below: The reaction must be:

    A) Exothermic

    B) Endothermic

    C) One with negligible enthalpy change

    D) Highly spontaneous at ordinary temperature

    Correct Answer: A

    Solution :

    [a] Exothermic According to van't Hoff equation, giving the effect of temperature on equilibrium constant, \[{{k}_{eq}}=A{{e}^{-\Delta H/RT}}\] or In \[{{k}_{eq}}=In\,A\,-\frac{\Delta \,H}{RT}\] In the given plot, InK increases with increase of 1/T i.e slope of the plot is +ve. Hence AH must be -ve i.e. reaction is exothermic.


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