A) \[B{{r}_{2}}(g)\]
B) \[C{{l}_{2}}(g)\]
C) \[{{H}_{2}}O\left( g \right)\]
D) \[C{{H}_{4}}(g)\]
Correct Answer: B
Solution :
[b] The species in its elemental form has zero standard molar enthalpy of formation at 298 K. At 298K, \[C{{l}_{2}}\] is gas while \[Br{{ }_{2}}\] is liquid.
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