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Thermodynamics — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryThermodynamics1 Mark
Question
At 1 atm will the $\Delta_{\mathrm{f}} \mathrm{H}^{\circ}$ be zero for $\mathrm{Cl}_2(\mathrm{g})$ and $\mathrm{Br}_2(\mathrm{g})$ ? Explain.
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Answer

$\Delta_{\mathrm{f}} \mathrm{H}^{\circ}$ for $\mathrm{Cl}_2(\mathrm{g})$ will be zero but $\Delta_{\mathrm{f}} \mathrm{H}^{\circ}$ for $\mathrm{Br}_2(\mathrm{g})$ will not be zero because liquid bromine is its elementary state and not gaseous bromine.

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