Three reactions involving H₂PO₄^− are given below: (i) H₃PO₄ + H₂O → H₃O⁺ + H₂PO₄^− (ii) H₂PO₄^− + H₂O → HPO₄^(2−) + H₃O⁺ (iii) H₂PO₄^− + OH⁻ → H₃PO₄ + O²⁻ In which of the above does H₂PO₄^− act as an acid?

Equilibrium: JEE Main 2010 Chemistry question

JEE Main 2010 · Annual, Paper 1 · Q1281

JEE Main 2010Annual, Paper 1ChemistryHardEquilibrium123× since 2002

Three reactions involving

H_2PO_4^−

are given below : (i) H₃PO₄ + H₂O

\to

H₃O⁺ +

H_2PO_4^−

(ii)

H_2PO_4^−

+ H₂O

\to

HPO_4^{2−}

+ H₃O⁺ (iii)

H_2PO_4^−

+ OH⁻

\to

H₃PO₄ + O²⁻ In which of the above does

H_2PO_4^−

act as an acid?