Concepts of acids and bases including HSAB, Bronsted‑Lowry and Lewis theories - One Line Questions

1. In the reaction: NH4+ <=> NH3 + H+. NH4+ is acting as: — A Bronsted-Lowry acid
2. The reaction between a Lewis acid and a Lewis base forms: — A complex
3. The strength of a Bronsted-Lowry acid is related to its ability to: — Donate protons
4. According to the Arrhenius theory, an acid is a substance that: — Increases the concentration of hydrogen ions in aqueous solution
5. According to the Lewis theory, an acid is a substance that: — Accepts an electron pair
6. Which of the following is an example of a hard acid? — Na+
7. Which of the following is a Lewis base? — CN-
8. In the Bronsted-Lowry theory, a base is defined as: — A proton acceptor
9. In the Lewis theory, a base is defined as: — An electron pair donor
10. Which theory provides the broadest definition of acids and bases? — Lewis theory
11. The principle 'Hard acids prefer to bind with hard bases and soft acids prefer to bind with soft bases' is the core of: — HSAB theory
12. In the reaction: Ag+ + 2CN- -> [Ag(CN)2]-. Silver ion (Ag+) is a soft acid and cyanide ion (CN-) is a soft base. This aligns with: — HSAB theory
13. Which theory correctly explains the acidity of BF3? — Lewis theory
14. The most general definition of acids and bases is provided by the: — Lewis theory
15. Consider the reaction: BF3 + :NH3 -> F3B:NH3. According to Lewis theory, which species acts as a Lewis base? — :NH3
16. Which of the following is a strong Lewis base? — PH3
17. In the reaction: CO2 + H2O <=> H2CO3, CO2 acts as a: — Lewis acid
18. Which of the following is an example of a hard base? — OH-
19. Which of the following metal ions is considered a hard acid? — Al3+
20. Which of the following is an example of a soft base? — I-
21. According to Lewis theory, the reaction between H+ and NH3 forms: — A coordinate covalent bond
22. The conjugate base of the hydronium ion (H3O+) is: — H2O
23. Which of the following species is a strong Lewis acid due to its vacant p-orbital? — BCl3
24. According to HSAB theory, 'soft' bases tend to bind with: — Soft acids
25. According to the HSAB principle, stability is generally observed when: — Hard acids bind with hard bases
26. Consider the reaction: HCl + H2O <=> H3O+ + Cl-. According to Bronsted-Lowry theory, which species is acting as an acid? — HCl
27. Which of the following species is amphoteric, meaning it can act as both an acid and a base according to Bronsted-Lowry theory? — H2O
28. According to the Bronsted-Lowry definition, when HCl reacts with NaOH, which species acts as the acid? — HCl
29. Which of the following is NOT a characteristic of a strong acid according to Arrhenius? — Ability to donate electrons
30. Which of the following is a characteristic of a 'soft' species in HSAB theory? — Large size and diffuse electron cloud
31. The conjugate base of H2SO4 is: — HSO4-
32. Which of the following is a characteristic of a hard base? — High electronegativity
33. Which of the following is a characteristic of a 'hard' acid in HSAB theory? — Small, highly charged cation
34. According to HSAB theory, which factor contributes to a species being classified as 'hard'? — Small size and high charge
35. Which of the following is an example of a soft acid? — Hg2+
36. Which of the following metal oxides is amphoteric? — Al2O3
37. In the Bronsted-Lowry acid-base reaction, NH3 + H2O <=> NH4+ + OH-, which species acts as a base? — NH3
38. Which of the following species is a Lewis acid? — BF3
39. What is the conjugate acid of water (H2O) in the Bronsted-Lowry theory? — H3O+
40. In the context of Lewis acids, which species can act as an acid by accepting a pair of electrons? — SO3
41. Which of the following is NOT a Bronsted-Lowry base? — BF3
42. According to Bronsted-Lowry theory, a conjugate acid-base pair differs by: — One proton
43. The Hard-Soft Acid-Base (HSAB) theory classifies acids and bases based on their: — Polarizability and charge density
44. The Lewis acid-base reaction involves the formation of a coordinate covalent bond. This is also known as: — Adduct formation
45. According to the Arrhenius definition, a substance that produces OH- ions in water is a: — Base
46. According to HSAB theory, 'hard' acids tend to bind with: — Hard bases
47. Which of the following is a characteristic property of a base according to Arrhenius? — Turns red litmus blue
48. All Bronsted-Lowry acids are also Lewis acids, but the reverse is not always true. This statement is: — False
49. All Bronsted-Lowry bases are also Lewis bases, but the reverse is not always true. This statement is: — False
50. Which of the following is a common example of a Lewis acid used in organic chemistry? — Aluminum chloride
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