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Which 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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