Which of the following is not Lewis base?
Correct answer: D. BF3
- A. NH3
- B. H2O
- C. Pyridine
- D. BF3
Explanation
The correct answer is BF3. A Lewis base is a substance that can donate a pair of electrons. NH3, H2O, and pyridine all have lone pairs of electrons available for donation, making them Lewis bases. In contrast, BF3 lacks lone pairs of electrons and features an electron-deficient boron atom that can accept electron pairs, classifying it as a Lewis acid. Therefore, BF3 is not a Lewis base.
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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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