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

  • question_answer
    If (i) \[C+{{O}_{2}}\to C{{O}_{2}}\], (ii) \[C+1/2{{O}_{2}}\to CO\], (iii) \[CO+1/2{{O}_{2}}\to C{{O}_{2}}\], the heats of reaction are \[Q,\,-12,\,-10\] respectively. Then \[Q=\] [Orissa JEE 2004]

    A)                 ? 2         

    B)                 2

    C)                 ? 22       

    D)                 ? 16

    Correct Answer: C

    Solution :

               \[C+{{O}_{2}}\to C{{O}_{2}}\]; \[\Delta H=q\]                    \[C+1/2{{O}_{2}}\to CO\]; \[\Delta H=-12\]       ?..(i)                    \[CO+1/2{{O}_{2}}\to C{{O}_{2}}\]; \[\Delta H=-10\] ?..(ii)                    adding equation (i) and (ii) we can get                                 \[\Delta H=-12+(-10)=-22\]


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