Chemistry - Thermochemistry Question with Solution | TestHub
ChemistryThermochemistryEnthalpy of FormationMedium2 minQB
ChemistryMediummultiple choice
For which of the following substance(s), the standard enthalpy of formation is/are zero?
Options:(select one or more)
Answer:
A, D
Solution:
Δf H° = 0 only for an element in its standard reference state at 298 K. For example, graphite for carbon and liquid Br₂ for bromine. O₃ is not the reference form of oxygen (O₂ is), and the reference state of iodine is I₂(s), not I₂(g). Therefore, options (a) and (d) are correct.
Stream:JEESubject:ChemistryTopic:ThermochemistrySubtopic:Enthalpy of Formation
⏱ 2mℹ️ Source: QB
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