A) \[\operatorname{PC}{{l}_{5}}\left( g \right)\,\xrightarrow{{}}\,\,PC{{l}_{3}}\left( g \right)\,\,+\,\,C{{l}_{2}}\left( g \right)\]
B) \[2CO\left( g \right) + {{O}_{2}}\left( g \right) \xrightarrow{{}} 2C{{O}_{2}}\left( g \right)\]
C) \[{{\operatorname{H}}_{2}}\left( g \right)+B{{r}_{2}}\left( g \right)\,\,\xrightarrow{{}}\,\,2HBr\,\left( g \right)\]
D) \[\operatorname{C}\left( s \right)+2{{H}_{2}}O\left( g \right) \xrightarrow{{}} 2{{H}_{2}}\left( g \right)+C{{O}_{2}} \left( g \right)\]
Correct Answer: C
Solution :
\[{{\operatorname{H}}_{2}}(g)\,\,+\,\,B{{r}_{2}}(g)\,\,\xrightarrow{{}}\,\,2HBr(g)\] \[\Delta ng = 0\] We know that \[\Delta H =MJ + \Delta {{n}_{g}}RT\] \[\Delta H=\Delta U\]
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