 - 1. Who proposed the Hard and Soft Acids and Bases (HSAB) principle in 1963?
A) Russell S. Drago B) Gilbert Lewis C) Ralph Pearson D) Robert Parr
- 2. Who helped make the HSAB theory quantitative in 1984?
A) Russell S. Drago B) Linus Pauling C) Ralph Pearson D) Robert Parr
- 3. Which term describes species that are small and weakly polarizable?
A) Intermediate B) Covalent C) Hard D) Soft
- 4. Which term describes species that are large and strongly polarizable?
A) Hard B) Electrostatic C) High charge D) Soft
- 5. According to HSAB theory, what are the most stable interactions?
A) Neutral-neutral B) Hard-covalent and soft-electrostatic C) Hard-soft and soft-hard D) Hard-hard and soft-soft
- 6. Who created the ECW model for Lewis acid-base interactions?
A) Ralph Pearson B) Robert Parr C) Russell S. Drago D) Svante Arrhenius
- 7. What does the symbol -ΔH represent in the ECW model?
A) Strength of Lewis acid-base interactions B) The W term constant C) Polarizability of the species D) Hardness of the acid
- 8. In the ECW model, what do the parameters E and C represent?
A) Electrostatic and covalent contributions B) Equilibrium and constant C) Enthalpy and concentration D) Energy and charge
- 9. What does the W term in the ECW equation represent?
A) The sum of electrostatic forces B) Constant energy contribution C) The polarizability constant D) The covalent bond strength
- 10. What does the ECW model predict regarding acid and base strengths?
A) Reversal of acid and base strengths B) That strengths are always constant C) A single linear order of strengths D) That strengths are independent of the partner
- 11. How are Lewis acids characterized in the ECW model?
A) E and W B) EA and CA C) C and W D) EB and CB
- 12. How are Lewis bases characterized in the ECW model?
A) EA and CA B) A and B C) E and W D) EB and CB
- 13. According to the ECW model, is there a single order of Lewis base strengths?
A) Only for hard acids B) Yes C) Only for soft bases D) No
- 14. What is a characteristic of 'Hard' species regarding their charge state?
A) Variable charge B) Neutral charge C) High charge state D) Low charge state
- 15. What is a characteristic of 'Soft' species regarding their charge state?
A) Negative charge only B) Positive charge only C) High charge state D) Low charge state
- 16. Which scientist generalized the Arrhenius definition to cover aprotic solvents in 1925?
A) Dinitrogen tetroxide B) Arrhenius C) Albert F.O. Germann D) Edward Curtis Franklin
- 17. What is the generic name for positive ions in solvent system theory?
A) Solvate ions B) Aprotic ions C) Solvonium ions D) Lyate ions
- 18. When solvent molecules are protonated, what are the resulting ions called?
A) Lyate ions B) Solvate ions C) Thionyl ions D) Lyonium ions
- 19. What is the correct term for deprotonated solvent molecules acting as negative ions?
A) Nitrosonium ions B) Lyonium ions C) Lyate ions D) Solvonium ions
- 20. In liquid ammonia, what substance acts as a strong base?
A) NH4NO3 B) NH4I C) Zn(NH2)2 D) KNH2
- 21. In liquid sulfur dioxide (SO2), which species behaves as an acid?
A) Nitrate B) Thionyl compounds C) Chloride D) Sulfites
- 22. According to the text, what is a major limitation of the Arrhenius definition?
A) Its reliance on temperature B) Its inability to define salts C) Its reliance on water solutions D) Its exclusion of bases
- 23. Which compound dissociates into chlorocarboxonium and chloride?
A) Phosgene B) Antimony trichloride C) Sulfuric acid D) Dinitrogen tetroxide
- 24. In the reaction of AgNO3 with NOCl in liquid N2O4, what is the solvent produced?
A) NOCl B) NO3 C) N2O4 D) AgCl
- 25. In what year was the Lewis definition first devised?
A) 1910 B) 1950 C) 1938 D) 1923
- 26. In what year was the Lewis definition elaborated by its creator?
A) 1925 B) 1940 C) 1938 D) 1923
- 27. According to the Lewis definition, what does a base do?
A) Receives an electron pair B) Receives a proton C) Donates a proton D) Donates an electron pair
- 28. According to the Lewis definition, what does an acid do?
A) Donates an electron pair B) Donates a proton C) Receives a proton D) Receives an electron pair
- 29. Which substance is cited as a typical Lewis acid in the text?
A) Water B) Ammonia C) Fluoride ion D) Boron trifluoride
- 30. What is the formula of boron trifluoride?
A) BF4 B) BF3 C) BF2 D) B3F
- 31. Group 13 elements with what formula generally behave as Lewis acids?
A) AX3 B) AX C) AX2 D) AX4
- 32. Group 15 elements with what formula can behave as Lewis bases?
A) DX2 B) AX3 C) DY2 D) DY3
- 33. Which of these is mentioned as an example of a group 15 Lewis base?
A) Ethers B) Thioethers C) Amines D) Boron trifluoride
- 34. Which group 16 compound formula acts as a Lewis base?
A) AX3 B) DX3 C) DX2 D) DY3
- 35. Which of these is an example of a group 16 Lewis base?
A) Phosphine B) Amine C) Ether D) Boron trifluoride
- 36. What is the adduct formed between boron trifluoride and carbon monoxide?
A) BF4-CO B) BF3-CO C) F3B←CO D) BCO-F3
- 37. Who introduced the word 'base' into chemistry in 1754?
A) Guillaume-François Rouelle B) Justus von Liebig C) Svante Arrhenius D) Antoine Lavoisier
- 38. Which theory of acids and bases is considered the most restrictive?
A) Arrhenius theory B) Lewis theory C) Brønsted–Lowry theory D) Lavoisier's oxygen theory
- 39. In the Arrhenius definition, what ion does an acid increase in concentration?
A) Na+ B) H+ or H3O+ C) Cl- D) OH-
- 40. According to Lavoisier, what element did all acids contain?
A) Oxygen B) Nitrogen C) Hydrogen D) Sulfur
- 41. Which theory defines an acid as a hydrogen-containing compound whose hydrogen can be replaced by a metal?
A) Arrhenius theory B) Brønsted–Lowry theory C) Liebig's hydrogen theory D) Lewis theory
- 42. What is the Brønsted–Lowry definition of a base?
A) An oxide of a metal B) A proton acceptor C) A hydrogen ion producer in water D) A hydroxide ion donor
- 43. What term describes a substance that can act as both an acid and a base?
A) Amphoteric B) Basic C) Acidic D) Neutral
- 44. What is the conjugate base of hydrochloric acid (HCl) according to the Brønsted–Lowry theory?
A) OH- B) H2O C) H3O+ D) Cl-
- 45. Which substance is used as a component in baking powder to react with sodium bicarbonate?
A) Sodium chloride B) Monocalcium phosphate C) Toluene D) Ammonia
- 46. Who proved that acids do not necessarily contain oxygen by studying H2S and hydrohalic acids?
A) Sir Humphry Davy B) Svante Arrhenius C) Jöns Jacob Berzelius D) Antoine Lavoisier
- 47. In the Brønsted–Lowry reaction between HCl and H2O, what is the conjugate acid of the base?
A) Cl- B) HCl C) H3O+ D) H2O
- 48. What gas is produced in the reaction of baking powder with water?
A) Carbon dioxide B) Nitrogen C) Oxygen D) Hydrogen
- 49. Which chemist proposed the original oxygen theory of acids and bases in 1939?
A) Mikhail Usanovich B) Gilbert Lewis C) Håkon Flood D) Hermann Lux
- 50. In the reaction MgO + CO2 ⟶ MgCO3, which component is the base?
A) Oxygen B) MgO C) MgCO3 D) CO2
- 51. In the reaction CaO + SiO2 ⟶ CaSiO3, which component is the acid?
A) SiO2 B) CaO C) Calcium D) CaSiO3
- 52. Whose theory published in 1938 was more general than the Lewis theory?
A) Mikhail Usanovich B) Hermann Lux C) Robert Boyle D) Håkon Flood
- 53. What does the Usanovich theory define as a special case of acid–base reactions?
A) Condensation reactions B) Redox reactions C) Isomerization D) Hydrolysis reactions
- 54. In the Usanovich reaction Na2O + SO3 ⟶ 2Na+ + SO42-, what acts as the base?
A) SO3 B) Na2O C) Na+ D) SO42-
- 55. What happens when a strong acid reacts with a strong base?
A) It is essentially a quantitative reaction B) It creates an equilibrium mixture C) It produces a buffer solution D) It always forms a gas
- 56. In the reaction AH + HPO42- <=> A- + H2PO4-, what does AH represent?
A) An arbitrary base B) A generic acid C) Adenine D) An ammonium ion
- 57. In the reaction NaOH -> Na+ + OH-, what is the state of the ions?
A) Liquid B) Aqueous C) Gaseous D) Solid
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