MHT CET202522 Apr 2025Evening ShiftChemistryIonic EquilibriumActual
Identify conjugate acid-base pair from following equilibrium reaction. HSO _ 3( aq ) ⁻+ H ₃ O _ ( aq ) ⁺ H ₂ SO ₃+ H ₂ O
Options
- AH ₂ SO ₃ and HSO ₃⁻
- BHSO ₃⁻ and H ₃ O ⁺
- CH ₂ SO ₃ and H ₂ O
- DH ₃ O ⁺ and H ₂ SO ₃
Correct answer
A. H ₂ SO ₃ and HSO ₃⁻
Step-by-step solution
Conjugate acid–base pairs are identified by the transfer of a single proton. For the reaction HSO ₃⁻ + H ₃ O ⁺ H ₂ SO ₃ + H ₂ O , HSO ₃⁻ gains a proton to form H ₂ SO ₃ , making them a conjugate base–acid pair. H ₃ O ⁺ loses a proton to form H ₂ O , forming a conjugate acid–base pair. Among the options, only A) H ₂ SO ₃ and HSO ₃⁻ represents a valid pair. Final answer: A