Which of the following is not Lewis acid?
Correct answer: D. Cl-
- A. HCl
- B. BF3
- C. AlCl3
- D. Cl-
Explanation
The correct answer is Cl-. A Lewis acid is defined as a substance that can accept an electron pair. In this context, Cl- is not a Lewis acid because it already possesses a full octet and is negatively charged, indicating it is more likely to donate an electron pair, thus acting as a Lewis base. On the other hand, HCl can become a Lewis acid when it dissociates, BF3 is electron-deficient and can accept electron pairs, and AlCl3 can also accept electron pairs due to its electron-deficient aluminum center.
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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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