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← ScienceWhich consequence results when thermal energy populates higher vibrational modes in molecular hydrogen?
A)Increased bond length thermal expansion✓
B)Decreased rotational kinetic energy
C)Atomic orbital energy level splitting
D)Suppressed electron spin polarization
💡 Explanation
Increased thermal energy excites higher vibrational modes, increasing the average internuclear distance via anharmonicity. This causes thermal expansion because the **potential energy curve** is asymmetric. Therefore, bond length increases, rather than distorting electron orbitals.
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