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In the following reaction
P
\( \mathrm{HC}_{2} \mathrm{O}_{4}^{-}+\mathrm{PO}_{4}^{-3} \rightleftharpoons \mathrm{HPO}_{4}^{-2}+\mathrm{C}_{2} \mathrm{O}_{4}^{-2} \). Which
W are the two Bronsted bases?
(1) \( \mathrm{HC}_{2} \mathrm{O}_{4}^{-} \)and \( \mathrm{PO}_{4}^{-3} \)
(2) \( \mathrm{HPO}_{4}^{-2} \) and \( \mathrm{C}_{2} \mathrm{O}_{4}^{-2} \)
(3) \( \mathrm{PO}_{4}^{-3} \) and \( \mathrm{C}_{2} \mathrm{O}_{4}^{-2} \)
(4) \( \mathrm{HC}_{2} \mathrm{O}_{4}^{-} \)and \( \mathrm{HPO}_{4}^{-2} \)
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