Question

Which of the following constitutes a set amphoteric species.

• A. H₃O⁺ ,$H_{2}PO_{4}^{-}$, $HCO_{3}^{-}$
• B. H₂O , $HPO_{4}^{2 -}$, $H_{2}PO_{2}^{-}$
• C. H₂O ,$H_{2}PO_{3}^{-}$, $HPO_{4}^{2 -}$
• D. $HC_{2}O_{4}^{-}$, $H_{2}PO_{4}^{-}$, $SO_{4}^{2 -}$

Answer 1

Answer: (C)

H₂O ,$H_{2}PO_{3}^{-}$, $HPO_{4}^{2 -}$

Answer 2

H₃O⁺ can not take up proton ; $H_{2}PO_{2}^{-}$ can not give up proton, $SO_{4}^{2 -}$ can not give proton