Questions

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 reactions does $H_{2} {PO}_{4}^{-}$ act as an acid?

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detailed solution

Correct option is B

The given reaction $H_{2} {PO}_{4}^{-} + H_{2} O \to {HPO}_{4}^{2 -} + H_{3} O^{+}$

The reaction (ii) provides $H_{3} O^{+}$ . Hence, in this reaction $H_{2} {PO}_{4}^{-}$ acts as an acid

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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 reactions does H2PO4−act as an acid?