At 25^(@)C and 1 bar which one of the following has a non zero DeltaH_ – InterviewSolution

1.	At 25^(@)C and 1 bar which one of the following has a non zero DeltaH_(f)^(@)?
Answer» `Br_(2)(1)`<BR>C (graphite) `I_(2)` `O_(3)(G)` Solution :Ozone `(O_(3))` the ALLOTROPIC form of oxygen is of higher energy (by 68 kcal `"mol"^(-1)`) than `O_(2)`. HENCE `O_(3)` can not be taken as the reference or standard state.

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