A) $ H_3PO_4 $
B) $ P_2O_5 $
C) $ PO_4^{3-} $
D) $ HPO_4^{2-} $
Correct Answer: D
$ \underset{\text{Conjugate acid}}{\mathop{H_2PO_4^{-}}},\to {H^{+}}+\underset{\text{Conjugate base}}{\mathop{HPO_4^{2-}}}, $
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