A) Heat of combustion of carbon is 110 kJ
B) Reaction is exothermic
C) Reaction needs no initiation
D) All of the above are correct
Correct Answer: B
Solution :
Key Idea: Analyse each of the statement carefully to find the correct answer. \[2C+{{O}_{2}}\to 2CO\Delta H=-220\,kJ\] [a] \[\because \] This reaction does not represent complete combustion of carbon. \[\therefore \] heat of combustion of carbon is not 110 kJ. [b] The negative sign of \[\Delta H\] indicates that it is exothermic reaction. So this statement is correct. [c] Despite being spontaneous, the reaction requires initiation.
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