An acid is a substance which accepts:
Correct answer: A. An electron pair
- A. An electron pair
- B. a proton
- C. an electron
- D. a pair of protons
Explanation
A Lewis acid is defined as a substance that accepts an electron pair to form a coordinate bond. Since the question uses this definition. Thus, the correct option is A.
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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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