A) \[{{H}_{2}}PO_{4}^{-}\]
B) \[PO_{4}^{3-}\]
C) \[{{H}_{3}}P{{O}_{4}}\]
D) \[{{H}_{3}}P{{O}_{3}}\]
Correct Answer: A
Solution :
Conjugate acid is obtained from the base by gain of \[{{H}^{+}}\].
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