Which of the following is not soft acid according SHAB concept?
Correct answer: A. K+
- A. K+
- B. Cu+
- C. Ag+
- D. Au+
Explanation
The HSAB (Hard and Soft Acids and Bases) concept classifies acids and bases as hard or soft. Hard acids have high charge density and less polarizability, while soft acids have low charge density and are more polarizable. K+ is a hard acid due to its small size and high charge density, making it different from the other options, which are soft acids. Cu+, Ag+, and Au+ are soft acids because they have lower charge density and greater polarizability, allowing them to form stable complexes with soft bases.
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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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