A) \[{{F}_{2}}(g)\]
B) \[F(g)\]
C) \[HF(aq)\]
D) \[{{F}^{-}}(aq)\]
Correct Answer: A
Solution :
Enthalpy of formation of an elements in its most stable state is called standard enthalpy of formation. It is zero for all elements. \[{{F}_{2}}(g)\]is the most stable state of fluorine, its enthalpy of formation is zero.
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