Conjugate base of HCO₃⁻ is
Correct answer: B. CO₃²⁻
- A. H₂CO₃
- B. CO₃²⁻
- C. All of these
- D. None of the above
Explanation
The conjugate base of an acid is formed when the acid loses a proton (H⁺). Here, the bicarbonate ion, HCO₃⁻, loses a proton to become CO₃²⁻, the carbonate ion, making CO₃²⁻ the correct conjugate base. Option A, H₂CO₃, is incorrect because it represents the conjugate acid of HCO₃⁻, which forms when a proton is added. Option C, All of these, is incorrect because only CO₃²⁻ is the conjugate base of HCO₃⁻. Option D, None of the above, is incorrect since CO₃²⁻ is the right answer.
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About Acids, Bases and Salts
Acid and base behaviour is explained through the Bronsted-Lowry transfer of protons and the Lewis donation or acceptance of electron pairs. The topic includes pH, pOH, ionisation and water equilibrium, plus salt formation and hydrolysis, where a salt solution may become acidic, basic or neutral.
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