Which of the following acid have highest pKa value?
Correct answer: A. HClO3
- A. HClO3
- B. HNO3
- C. H2SO4
- D. HClO4
Explanation
The pKa value of an acid is inversely related to its strength; the higher the pKa, the weaker the acid. Among the given options, HClO3 is a strong acid but not as strong as HNO3 or H2SO4, which have lower pKa values. HClO4 is an even stronger acid than HClO3. Therefore, HClO3 has the highest pKa value in this list.
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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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