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

  • question_answer
    For the reaction                 \[PC{{l}_{5}}(g)\to PC{{l}_{3}}(g)+C{{l}_{2}}(g)\]                [MH CET 2004]

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

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

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

    D)                 None of these

    Correct Answer: B

    Solution :

               \[PC{{l}_{5}}(g)\to PC{{l}_{3}}(g)+C{{l}_{2}}(g)\]                    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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