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NEET Chemistry Chemical Kinetics / रासायनिक बलगतिकी Question Bank Self Evaluation Test - Chemical Kinetics

  • question_answer
    The reaction \[X\to Y\] is an exothermic reaction. Activation energy of the reaction for X into Y is\[150\,kJ\,mo{{l}^{-1}}\]. Enthalpy of reaction is\[135\text{ }k\,J\,mo{{l}^{-1}}\]. The activation energy for the reverse reaction, \[Y\to X\] will be:

    A) \[280\,kJ\,mo{{l}^{-1}}\]                     

    B) \[285\text{ }kJmo{{l}^{-1}}\]

    C) \[270\text{ }kJ\,mo{{l}^{-1}}\]            

    D) \[15\,kJ\,mo{{l}^{-1}}\]

    Correct Answer: B

    Solution :

    [b] \[X\xrightarrow{{}}Y;\Delta H=-135\,kJ/mol,\] \[{{E}_{a}}=150kJ/mol\] For an exothermic reaction \[{{E}_{a(F.R)}}=\Delta H+E{{'}_{a(B.R.)}}\] \[150=-135+E{{'}_{a(B.R.)}}\] \[E{{'}_{a(B.R.)}}=285kJ/mol\]


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