A) \[~{{H}_{3}}P{{O}_{4}}\]
B) \[~HP{{O}_{3}}\]
C) \[{{H}_{4}}{{P}_{2}}{{O}_{7}}\]
D) \[~{{H}_{4}}{{P}_{2}}{{O}_{6}}\]
Correct Answer: A
Solution :
\[{{\text{H}}_{\text{3}}}\text{P}{{\text{O}}_{\text{4}}}\](orthophosphoric acid) is a tribasic acid because it has three replaceable hydrogen atoms.
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