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# The conjugate base of $H_2PO_{4^{-}}$ is

$\begin{array}{1 1}(A)\;PO_4^{3-} \\(B)\;HPO_4^{2-} \\(C)\;H_3PO_4 \\ (D)\;P_2O_5 \end{array}$
The conjugate base of $H_2PO_{4^{-}}$ is $HPO_4^{2-}$