Question

In which of the reactions given below does H2PO4^- behave as an acid?(i) $H_{3}P{O}_4+H_{2}O\to H_3{O}^{+}+H_{2}P{O}_4^{-}$(ii) $H_{2}P{O}_4^{-}+H_{2}O\to H_3{O}^{+}+HP{O}_4^{2-}$(iii) $H_{2}P{O}_4^{-}+O{H}^{-}\to H_{3}P{O}_4+O^{2-}$

• (A) (i) and (ii)
• (B) Only (ii)
• (C) Only (i)
• (D) Only (iii)

Answer 1

The Correct Option is B

Explanation:
Only in the reaction (ii), H2PO4^- behaves as a proton donor and is an acid by both Arrhenius and Bronsted concepts.