A) \[{{N}_{2}}(g)+{{O}_{2}}(g)+180.8\,kJ\to 2NO(g)\]
B) \[{{N}_{2}}(g)+3{{H}_{2}}(g)-92\,kJ\to 2N{{H}_{3}}(g)\]
C) \[C(g)+{{H}_{2}}O(g)\to CO(g)+{{H}_{2}}(g)\]\[-131.1\,kJ\]
D) \[C(graphite)+2S(s)\to C{{S}_{2}}(l)-91.9\,kJ\]
Correct Answer: B
Solution :
The reactions in which products has less energy than reactants then energy is released in the reaction and such reactions are known as exothermic reaction, e.g.,\[{{N}_{2}}+3{{H}_{2}}\xrightarrow{{}}2N{{H}_{3}}+92\,kJ\] In this equation energy is released so, it is an example of exothermic reaction.
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