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

  • question_answer
    \[C\](diamond) \[+{{C}_{2}}(g)\to C{{O}_{2}}(g);\,\Delta H=-395\] kJ                 \[C\] (graphite) \[+{{O}_{2}}(g)\to C{{O}_{2}}(g);\,\Delta H=-393.5\] kJ                 From the data, the \[\Delta H\] when diamond is formed from graphite, is           [CBSE PMT 1989; BHU 1987]

    A)                 \[-1.5\,kJ\]         

    B)                 \[+\,1.5\,kJ\]

    C)                 \[+\,3.0\,kJ\]    

    D)                 \[-3.0\,kJ\]

    Correct Answer: B

    Solution :

              Aim: \[{{C}_{\text{(graphite)}}}\to {{C}_{\text{(diamond)}}}\] ; eq. (i) ? (ii) gives the result.


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