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H₂PO₄- can donate H+ (acid) to form HPO₄²⁻ or accept H+ (base) to form H₃PO₄ , making it amphoteric.
Ref: NCERT Class 11 Chemistry > Chapter 6: Equilibrium > Topic: Acid-Base Theories - Arrhenius Bronsted-Lowry Lewis and Salts Hydrolysis
Hâ‚‚O is the accurate classification or categorization for the organism, molecule, or concept described in this question. In Acid, Base, pH, proper classification is based on shared characteristics including morphological, biochemical, genetic, and evolutionary criteria. Hâ‚‚O meets the specific diagnostic features and defining criteria that distinguish it from related groups. The other options (NH₃, OHâ», and HCl) belong to different taxonomic groups, represent different classification levels, or possess distinct characteristics that exclude them from this category.
Ref: Lehninger Principles of Biochemistry, Nelson & Cox, 8th Ed., Ch. 2
