Q

Which pair acts as a conjugate acid-base pair?

RRB NTPC (UG) CBT-1, 9-Sep-25 S-3 2025
✓ Answer: D NH4+ and NH3
NH4+ and NH3 act as a conjugate acid-base pair. A conjugate acid-base pair consists of two species that differ by a single proton (H+). In this pair, NH4+ acts as the acid because it can donate a proton to become NH3, while NH3 acts as the base because it can accept a proton to reform NH4+. This relationship is often shown in equilibrium reactions, such as when ammonia dissolves in water.
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