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Which outcome follows localized electron promoted to antibonding orbital photochemical excitation titanium dioxide?

A)Catalytic activity enhancement
B)Band gap energy decrease
C)Electrical conductivity reduction
D)Increased refractive index change

💡 Explanation

When an electron is promoted to an antibonding orbital via photochemical excitation of titanium dioxide, increased electron-hole separation occurs because the antibonding state destabilizes bonds, leading to enhanced surface reactivity driving redox reactions. Therefore catalytic activity enhancement results, rather than change conductivity/refraction which primarily relate total e-population.

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