Which of the following cannot have a conjugate base?

1.	Which of the following cannot have a conjugate base?
A.	\[{{H}_{2}}PO_{2}^{-}\]
B.	\[HCO_{3}^{-}\]
C.	\[{{H}_{2}}{{O}_{2}}\]
D.	\[HSO_{4}^{-}\]
Answer» B. \[HCO_{3}^{-}\]

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Which of the following cannot have a conjugate base?

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