A) $ H_3PO_4 $
B) $ H_3PO_3 $
C) $ H_2PO_3^{-} $
D) $ PO_4^{3-} $
Correct Answer: C
$ \underset{\text{Conjugate acid}}{\mathop{H_2PO_4^{-}}}, $ ⇌ $ {H^{+}}+HPO{{_4^{2}}^{-}} $ action.
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