Three reactions involving {\H}_2 {\PO}_4^{-}are given below : (i) {\H}_3 {\PO}_4+ {\H}_2 {\O} \to {\H}_3 {\O}^{+}+ {\H}_2 {\PO}_4^{-} (ii) {\H}_2 {\PO}_4^{-}+ {\H}_2 {\O} \to {\HPO}_4^{2-}+ {\H}_3 {\O}^{+} (iii) {\H}_2 {\PO}_4^{-}+ {\OH}^{-} \to {\H}_3 {\PO}_4+ {\O}^{2-} In which of the above does {\H}_2 {\PO}_4^{-}act as an acid? [AIEEE 2010]

AIEEE 2010 Solved Paper

Section: Chemistry

Question : 7 of 89

Marks: +1, -0

Three reactions involving H2PO4−are given below :
(i) H3PO4+H2O→H3O++H2PO4−
(ii) H2PO4−+H2O→HPO42−+H3O+
(iii) H2PO4−+OH−→H3PO4+O2−
In which of the above does H2PO4−act as an acid?

[AIEEE 2010]

(ii) only
(i) and (ii)
(iii) only
(i) only

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