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Q.
Which of these species has a standard enthalpy of formation equal to zero?
Delhi UMET/DPMTDelhi UMET/DPMT 2010
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.