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