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Question

Which is the set of amphiprotic species?

A
H3O+,HPO24,HCO3
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B
H2O,HPO23,H2PO2
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C
H2PO4,H2PO3,H2O
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D
All of these
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Solution

The correct option is C H2PO4,H2PO3,H2O
A species that has the potential to act both as an acid by donating H+ and as a base by accepting H+ according to bronsted - lowry theory is said to be amphiprotic.
H3O+ can't accept H+ more. So it can't act as base. Consequently aren't considered as amphiprotic species.
HPO23 and H2PO2 can't donate H+ any more. So, they can't act as acid and consequently aren't considered as amphiprotic species.

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