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

  • question_answer
    The values of heat of formation of \[S{{O}_{2}}\] and \[S{{O}_{3}}\] are \[-298.2\,kJ\] and \[-98.2\,kJ\]. The heat of reaction of the following reaction will be                 \[S{{O}_{2}}+\frac{1}{2}{{O}_{2}}\to S{{O}_{3}}\]              [BHU 1997; CBSE PMT 2000]

    A)                 \[-200\,kJ\]        

    B)                 \[-356.2\,kJ\]

    C)                 \[+200\,kJ\]       

    D)                 \[-396.2\,kJ\]

    Correct Answer: C

    Solution :

           \[S+{{O}_{2}}\to S{{O}_{2}}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\Delta H=-298.2\,\,kJ\]               ?.(i)            \[S{{O}_{2}}+\frac{1}{2}{{O}_{2}}\to S{{O}_{3}}\,\,\,\,\,\Delta H=-98.2\,\,kJ\]          ?.(ii)                                 eq. (i) ? (ii) and find the required result.


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