What is the conjugate acid of $HPO_4^{2-}$?
- A$H_3PO_4$
- B$H_2PO_4^-$
- C$H_3O^{+}$
- D$PO_4^{3-}$
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Identify the amphoteric species among the following:
$(I) \, H_2O$
$(II) \, NH_2^-$
$(III) \, H_2PO_4^-$
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$(I) \, H_2O$
$(II) \, NH_2^-$
$(III) \, H_2PO_4^-$
$(IV) \, HCO_3^-$
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