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Question

Which of the following is not a conjugate acid-base pair?

A
HPO23,PO33
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B
H2PO4,HPO24
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C
H2PO4,H3PO4
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D
H2PO4,PO33
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Solution

The correct option is D H2PO4,PO33
H2PO4,PO33 is not a conjugate acid-base pair as it differs by two protons.
A conjugate acid-base pair differs by one proton only. For example, HCl and Cl ion differ by one proton only. Hence, they are the conjugate acid-base pair.
Thus,
(A) HPO23,PO33, (B) H2PO4,HPO24 and (C) H2PO4,H3PO4 are conjugate acid base pairs as they differ by one proton only.

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