A) $ H_3PO_4 $
B) $ H_2PO_4^{-} $
C) $ PO_4^{3-} $
D) $ H_3{O^{+}} $
Correct Answer: A
$ \underset{\text{Conjugate acid}}{\mathop{H_3PO_4}}, $ ⇌ $ {H^{+}}+H_2PO_4^{-} $
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