Which of the following is not hard acid according SHAB concept?
Correct answer: A. Cu+
- A. Cu+
- B. Li+
- C. K+
- D. Na+
Explanation
According to the Hard and Soft Acids and Bases (HSAB) concept, hard acids are characterized by small size, high charge density, and low polarizability. Cu+ is a soft acid because it is more polarizable and does not have the high charge density typical of hard acids. In contrast, Li+, K+, and Na+ are all hard acids due to their small sizes and high charge densities, which make them less polarizable.
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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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