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