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