Answer :
The statement "A resonance-stabilized conjugate base that delocalizes a negative charge onto oxygen is stronger than a base with a charge on nitrogen" is true because oxygen is a more electronegative element than nitrogen, and as such, it can more effectively stabilize a negative charge through resonance.
When a molecule with a conjugate base has more than one resonance form, it is referred to as resonance stabilization. The resonance-stabilized conjugate base that delocalizes the negative charge onto oxygen is stronger than a base with a charge on nitrogen.
Oxygen's higher electronegativity means that it can more efficiently stabilize a negative charge by resonance than nitrogen. In addition, the negative charge is spread over two or more atoms in a conjugate base with multiple resonance forms, rather than just one atom.
As a result, the negative charge is less concentrated and more stable, making the resonance-stabilized conjugate base stronger overall.
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