MCQ
The species which by definition has $ZERO$ standard molar enthalpy of formation at $298 \mathrm{~K}$ is
- A$\mathrm{Br}_2(\mathrm{~g})$
- ✓$\mathrm{Cl}_2(\mathrm{~g})$
- C$\mathrm{H}_2 \mathrm{O}(\mathrm{g})$
- D$\mathrm{CH}_4(\mathrm{~g})$
✓
Answer
Correct option: B.
$\mathrm{Cl}_2(\mathrm{~g})$
b
$\mathrm{Cl}_2$ is gas at $298 \mathrm{~K}$ while $\mathrm{Br}_2$ is a liquid.
$\mathrm{Cl}_2$ is gas at $298 \mathrm{~K}$ while $\mathrm{Br}_2$ is a liquid.
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