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