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JEE Main & Advanced Chemistry Thermodynamics / रासायनिक उष्मागतिकी Question Bank Heat of reaction

  • question_answer
    On combustion, carbon forms two oxides CO and \[C{{O}_{2}}\], Heat of formation of \[C{{O}_{2}}\] gas is 94.3 kcal and that of CO is 26.0 kcal. Heat of combustion of carbon is          [JIPMER 2002]

    A)                 26.0 kcal              

    B)                 ? 94.3 kcal

    C)                 68.3 kcal              

    D)                 ? 120.3 kcal

    Correct Answer: B

    Solution :

           \[C+{{O}_{2}}\to C{{O}_{2}},\,\,\,\Delta H=-\,94.3\]            This is also heat of formation of \[C{{O}_{2}}\]                                 \[C+\frac{1}{2}{{O}_{2}}\to CO,\,\,\,\Delta H=-26.0\].


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