Which of the following is not soft base according SHAB concept?
Correct answer: A. F-
- A. F-
- B. CN-
- C. H-
- D. R-
Explanation
The correct answer is F- because it is a hard base according to the SHAB concept. Hard bases are characterized by small size and high electronegativity, which is true for the fluoride ion. In contrast, CN-, H-, and R- are larger with lower charge densities, categorizing them as 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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