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

  • question_answer
    For the gaseous reaction,                 \[{{N}_{2}}{{O}_{4}}\to 2N{{O}_{2}}\]     [Pb. CET 2003]

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

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

    C)                 \[\Delta H=0\]  

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

    Correct Answer: D

    Solution :

               \[{{N}_{2}}{{O}_{4}}(g)\to 2N{{O}_{2}}(g)\]                    For this reaction \[\Delta ng=2-1=1\]                                 \[\Delta ng\] is positive i.e., there is an increase in the number of gaseous moles then \[\Delta H>\Delta E\]


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