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

  • question_answer
    A mixture of two moles of carbon monoxide and one mole of oxygen, in a closed vessel is ignited to convert the carbon monoxide to carbon dioxide. If \[\Delta H\] is the enthalpy change and \[\Delta E\] is the change in internal energy, then      [KCET 2005]

    A)                 \[\Delta H>\Delta E\]    

    B)                 \[\Delta H<\Delta E\]

    C)                 \[\Delta H=\Delta E\]

    D)                 The relationship depends on the capacity of the vessel

    Correct Answer: B

    Solution :

              Formation of \[C{{O}_{2}}\] from \[CO\] is an exothermic reaction; heat is evolved from the system, i.e., energy is lowered. Thus, exothermic reactions occur spontaneously on account of decrease in enthapy of system. Thus, \[\Delta E>\Delta H\].


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