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← ScienceWhich outcome follows thermally exciting molecular iodine (I₂)?
A)Bond dissociation causes purple vapor.✓
B)Increased viscosity impairs fluid flow.
C)The gas will remain clear.
D)Crystal formation reduces vapor pressure.
💡 Explanation
Thermally exciting I₂ provides energy for bond dissociation, overcoming the binding energy. Breaking the bonds generates more free iodine atoms. Iodine vapor is purple because of the absorption spectrum change; therefore correct answer A, rather than a change in any material properties.
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