Which of the following is not acid according to Lux-Flood concept?
Correct answer: A. CaO
- A. CaO
- B. CO2
- C. SO3
- D. SiO2
Explanation
The Lux-Flood concept defines acids as species that can accept oxide ions, while bases are those that can donate oxide ions. CaO, a basic oxide, can donate oxide ions, thus acting as a base rather than an acid in this context. In contrast, CO2, SO3, and SiO2 can accept oxide ions, making them acidic according to the Lux-Flood concept. Therefore, the correct answer is CaO, which is not an acid in this framework.
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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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