A) \[{{H}_{3}}P{{O}_{4}}\]
B) \[HP{{O}_{4}}^{2-}\]
C) \[P{{O}_{4}}^{3-}\]
D) \[{{H}_{2}}PO{{ }_{3}}^{-}\]
Correct Answer: B
Solution :
Key Idea: Conjugate acid base pair differ by \[{{\text{H}}^{\text{+}}}.\]Proton donors are acid \[\text{Acid}-{{H}^{+}}\xrightarrow{{}}\text{Base}\] \[\underset{acid}{\mathop{{{H}_{2}}P{{O}_{4}}}}\,-{{H}^{+}}\xrightarrow{{}}\underset{\text{conjugate}\,\text{base}}{\mathop{HPO_{4}^{2-}}}\,\]
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