KCET2013ChemistryIonic Equilibrium
Conjugate base of H ₂ PO ₄⁻ is
Options
- AHPO ₄⁻
- BHPO ₄²⁻
- CH ₃ PO ₄
- DPO ₄³⁻
Correct answer
B. HPO ₄²⁻
Step-by-step solution
A conjugate pair of acid and a base differs by a proton only, i.e., conjugate acid conjugate base + H ⁺ H ₂ PO ₄⁻ HPO ₄²⁻+ H ⁺ Thus, H ₂ PO ₄⁻ can give a proton and hence is an acid while HPO ₄²⁻ can accept the proton and hence is a base.