A) \[{{H}_{3}}P{{O}_{4}}\]
B) \[{{H}_{3}}P{{O}_{3}}\]
C) \[{{H}_{3}}P{{O}_{2}}\]
D) \[HP{{O}_{3}}\]
Correct Answer: A
Solution :
Orthophosphoric acid \[{{H}_{3}}P{{O}_{4}}\] is tribasic because it contains three replaceable H-atoms.
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