A) \[{{H}_{4}}\text{ }EDTA\]tetrabasic
B) \[{{H}_{2}}S{{O}_{4}}\]dibasic
C) \[{{H}_{3}}P{{O}_{4}}\]tribasic
D) \[{{H}_{3}}P{{O}_{2}}\]
Correct Answer: D
Solution :
\[{{H}_{3}}P{{O}_{2}}\] is not tribasic. This is dibasic.
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