Question

Three reactions involving $H_2PO_4^-$ are given below :
(i) $H_3PO_4 + H_2O \rightarrow H_3O^+ + H_2PO_4^-$
(ii) $H_2PO_4^- + H_2O \rightarrow HPO_4^{2-} + H_3O^+$
(iii) $H_2PO_4^- + OH^- \rightarrow H_3PO_4 + O^{2-}$
In which of the above does H2PO4- act as an acid ? [2010]
(a) (ii) only
(b) (i) and (ii)
(c) (iii) only
(d) (i) only

Answer 1

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