Which of the following is Lewis acid?
Correct answer: D. All of these
- A. FeCl₃
- B. AlCl₃
- C. BF3
- D. All of these
Explanation
The correct answer is All of these because all the compounds listed (FeCl₃, AlCl₃, and BF3) are Lewis acids. A Lewis acid is defined as a substance that can accept a pair of electrons to form a covalent bond. In FeCl₃, the iron atom is electron-deficient and can accept an electron pair. Similarly, AlCl₃ has an electron-deficient aluminum atom that can accept an electron pair, and BF3 has a boron atom with an incomplete octet, making it capable of accepting an electron pair. Therefore, each of these compounds can act as a Lewis acid.
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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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