A) \[{{H}^{+}}(aq)+O{{H}^{-}}(aq)\to {{H}_{2}}O(l)+heat\]
B) \[C\text{(graphite)}+\frac{1}{2}{{O}_{2}}(g)\to CO(g)+\text{heat}\]
C) \[C{{H}_{4}}(g)+2{{O}_{2}}(g)\to C{{O}_{2}}(g)+2{{H}_{2}}O(l)+\,heat\]
D) \[{{H}_{2}}S{{O}_{4}}(aq)+{{H}_{2}}O(l)\to {{H}_{2}}S{{O}_{4}}(aq)+heat\]
Correct Answer: C
Solution :
The amount of heat evolved or absorbed when 1 mole of the substance is completely oxidised is called heat of combustion. For example, \[C{{H}_{4}}(g)+2{{O}_{2}}(g)\to C{{O}_{2}}(g)+2{{H}_{2}}O(l)+\text{heat}\]
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