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Question

Which of the following is a conjugate acid-base pair?

A
H3PO4 and H2PO4
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B
H3PO3 and HPO23
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C
H2PO4 and PO34
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D
H2PO3 and PO33
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Solution

The correct option is A H3PO4 and H2PO4
A conjugate acid-base pair is the one in which the acid and its conjugate base or vice versa, differ in only one proton (H+)
From the given options, there is only one such pair which is H3PO4 and H2PO4.
Now, H3PO4H++H2PO4
Here, the acid H3PO4 loses a proton to give H2PO4 which is its conjugate base.
Hence H3PO4 and H2PO4 is a conjugate acid-base pair.

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