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JEE Main & Advanced Chemistry Thermodynamics / रासायनिक उष्मागतिकी Question Bank First law of thermodynamics and Hess law

  • question_answer
    If \[\Delta H\] is the change in enthalpy and \[\Delta E\] the change in internal energy accompanying a gaseous reaction KCET 1989; CBSE PMT 1990]

    A)                 \[\Delta H\] is always greater than \[\Delta E\]

    B)                 \[\Delta H<\Delta E\] only if the number of moles of the products is greater than the number of the reactants

    C)                 \[\Delta H\] is always less than \[\Delta E\]

    D)                 \[\Delta H<\Delta E\] only if the number of moles of the products is less than the number of moles of the reactants

    Correct Answer: D

    Solution :

              If \[\Delta n=-ve\] than \[\Delta H<\Delta E\].


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