A) \[{{H}_{3}}P{{O}_{4}}\]
B) \[{{H}_{3}}P{{O}_{3}}\]
C) \[{{H}_{3}}P{{O}_{2}}\]
D) \[{{H}_{4}}{{P}_{2}}{{O}_{7}}\]
Correct Answer: A
Solution :
Orthophosphoric acid \[({{H}_{3}}P{{O}_{4}})\] is tribasic. Pyrophosphoric acid \[({{H}_{4}}{{P}_{2}}{{O}_{7}})\] is tetrabasic. Basicity of an acid is the number of replaceable H-atom.
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