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JEE Main & Advanced Sample Paper JEE Main Sample Paper-23

  • question_answer
    Following are the values of \[{{E}_{a}}\] and \[\Delta H\] for three reactions carried out at the same temperature:
    I: \[{{E}_{a}}=20\,kJ\,mo{{l}^{-1}},\Delta H=-60\,kJ\,mo{{l}^{-1}}\]
    II: \[{{E}_{a}}=10\,kJ\,mo{{l}^{-1}},\Delta H=-20\,kJ\,mo{{l}^{-1}}\]
    III: \[{{E}_{a}}=40\,kJ\,mo{{l}^{-1}},\Delta H=+15\,kJ\,mo{{l}^{-1}}\]
    If all the three reaction have same frequency factor then fastest and slowest reactions are:

    A)
    Fastest Slowest
    I II

    B)
    Fastest Slowest
    II III

    C)
    Fastest Slowest
    I III

    D) Can?t be predicted.

    Correct Answer: B

    Solution :

    The rate of reaction is decided by value of rate constant which depends on energy of activation not on the value of \[\Delta H,\] definitely the comparison of rate of reactions of backward reactions can be done if \[\Delta H\] values are also given to us.


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