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

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    \[2C+{{O}_{2}}\to 2CO;\,\,\Delta H=-220\,kJ\] Which of the following statement is correct for this reaction [BVP 2004]

    A)                 Heat of combustion of carbon is 110 kJ

    B)                 Reaction is exothermic

    C)                 Reaction needs no initiation

    D)                 All of these are correct

    Correct Answer: B

    Solution :

               \[2C+{{O}_{2}}\to 2CO\]; \[\Delta H=-220\,KJ\] This reaction does not represent complete combustion of carbon, hence heat of combustion of carbon will not be equal to \[110\,kJ\]. The negative sign of \[\Delta H\] indicates that this reaction is exothermic. Also, despite being spontaneous reaction, it requires initiation.


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