In the equilibrium system described by: PO43 - (aq) + H2O (1) = HPO42 - (aq) + OH - (aq) Brønsted-Lowry theory would designate: A) PO43 - and H20 as the bases B) H20 and OH as a conjugate pair C) HPO42 - and OH"" as the acids D) HPO42 - and H20 as a conjugate pair E) PO43-as amphiprotic

The correct option is: B) H₂0 and OH⁻ as a conjugate pair

Explanation:

According to Brønsted-Lowry theory, the acids are the chemical substances that form a conjugate base by donating a proton and bases are the chemical substances that form conjugate acid by accepting a proton.

In the given chemical reaction: PO₄³⁻ (aq) + H₂O (l) ⇄ HPO₄²⁻ (aq) + OH⁻ (aq)

According to Brønsted-Lowry theory, PO₄³⁻ and OH⁻ are bases. Whereas, H₂O and HPO₄²⁻ are acids.

Also, PO₄³⁻ and HPO₄²⁻ are the conjugate acid-base pair; and H₂O and OH⁻ are the conjugate acid-base pair.