Acids and Bases in inorganic chemistry

By: Prof. Dr. Fazal Rehman | Last updated: May 23, 2025

1. : What is the pH of tears?
(A) 7.0
(B) 7.8
(C) 7.4
(D) 8.2

2. : Which of the mentioned concept is also called electron pair-donor acceptor system?
(A) Lewis
(B) Bronsted-Lowery
(C) Lux-Flood
(D) Usanovich

3. : Bases and reducing agents are electron-giving agents and known as ___?
(A) Nucleophile
(B) Electrophile
(C) Electrodative
(D) None of A, B, and C

4. : Lewis concept explains the formation of which bond?
(A) Ionic bond
(B) Co-ordinate bond
(C) Covalent bond
(D) Chemical bond

5. : Lux-Flood concept is a donor-acceptor system of which of the following?
(A) Proton
(B) Oxide ion
(C) Neutron
(D) Electron pair

6. : Which of the mentioned is not a soft acid according to SHAB concept?
(A) Ag+
(B) Cu+
(C) K+
(D) Au+

7. : According to _____, “Acids are substances whose aqueous solutions turn blue litmus red and taste sour”.
(A) Davy
(B) Liebig
(C) Rouelle
(D) Boyle

8. : Arrhenius concept explained ______
(A) Catalytic property of acid
(B) Quantitative determination of acid/base strength
(C) Constant heat of neutralization
(D) All of A, B, and C

9. : As said by Usanovich, a base is defined as any species ________ .
(A) Capable of giving up anions
(B) Combining with cations
(C) Neutralizing an acid to give a salt
(D) All of A, B, and C

10. : Which of the mentioned is not a Lowery-Bronsted Base?
(A) HS⁻
(B) H₂O
(C) NH3
(D) Cl⁻

11. : What is the pH of milk?
(A) 6.0
(B) 6.7
(C) 7.0
(D) 7.5

12. : Which of the mentioned concept is also called proton-donor acceptor system?
(A) Bronsted-Lowery
(B) Lewis
(C) Lux-Flood
(D) Usanovich

13. : According to SHAB, Lewis acids are divided into how many classes?
(A) Two classes
(B) Three classes
(C) Four classes
(D) None of A, B, and C

14. : What is the relative order of acidity of HF, HCl, HBr and HI acids?

15. : What is the relative order of acidity of oxy acids?
16. : What is the pH of pure water at 25°C? (Kw = 1 × 10⁻¹⁴)
(A) 1
(B) 7
(C) 12
(D) None of A, B, and C

17. : As said by SHAB concept, which of the mentioned is not a hard acid?
(A) Cu+
(B) Li+
(C) K+
(D) Na+

18. : What is the ionic product equilibrium constant?
(A) Ka
(B) Kb
(C) Kc
(D) Kw

19. : The value of Kw increases with temperature due to the ionization of water _______ .
(A) Decreases
(B) Remains constant
(C) Increases
(D) None of A, B, and C

20. : According to SHAB concept, the Lewis bases were classified on the basis of which of the following?
(A) Charge ion size
(B) Polarization consideration
(C) Electron and coordinating ability
(D) All of A, B, and C

21. : The one in which the acceptor atom is of low positive charge, large size and has numerous outer electrons which can be easily excited is a ________ base.
(A) Soft Base
(B) Hard Base
(C) Soft Acid
(D) Hard Acid

22. : According to ______ phenomenon, all the strong acids have very close pKa values and they seem to have nearly equal strengths in aqueous solutions.
(A) Leveling effect
(B) Debye effect
(C) Electrophoretic effect
(D) Solvent effect

23. : The concentration of OH ions in a particular household ammonia solution is 0.0025. This ammonia solution is _______ .
(A) Basic
(B) Acidic
(C) Neutral
(D) None of A, B, and C

24. : What is the pH of the 0.1 M HCl solution?
(A) 0.01
(B) 0.1
(C) 0.2
(D) 1

25. : The pH of the 1 M HCl is
(A) 0
(B) 0.1
(C) 1
(D) 0.2

26. : The sum of pH and pOH is equal to ___ .
(A) 12
(B) 13
(C) 14
(D) 2

27. : The most convenient and has nearest approach to a universal pH measurement is
(A) pH strips
(B) pH indicator
(C) The emf method
(D) The colorimetric

28. : Buffer solution are used to
(A) Increase the pH
(B) Decrease the pH
(C) Resist the pH
(D) None of A, B, and C

29. : A mixture of weak acid and its salt is ________.
(A) Alkaline buffer
(B) Acidic buffer
(C) Neutral buffer
(D) All of A, B, and C

30. : Glass electrode cannot be used to measure the pH of pure
(A) Acetic acid
(B) Ethyl alcohol
(C) Gelatin
(D) All of A, B, and C

31. : Which of the following have pH value of 4.2?
(A) Vinegar
(B) Lemons
(C) Oranges
(D) Tomatoes

32. : If the pH of solution is 1, What will be its pOH?
(A) 13
(B) 16
(C) 7
(D) None of A, B, and C

33. : Which of the mentioned is not true regarding buffers?
(A) Are made up of weak acid and its salt
(B) They are made up of weak base and its salt
(C) They tend to resist a change in pH value
(D) They are made up of strong acid and weak base

34. : Which of the mentioned mixture does not act as buffers?
(A) Acetic acid/sodium acetate
(B) Phosphoric acid/sodium phosphate
(C) Sodium chloride/hydrochloric acid
(D) Trisbase/HCl

35. : What is the pH of human stomach?
(A) 1.5 to 2.5
(B) 3.0 to 8.0
(C) 6.0 to 7.2
(D) None of A, B, and C

36. : Which of the mentioned is not Lowery-Bronsted acid?
(A) HCl
(B) H₂O
(C) HS
(D) Cl

37. : Which of the mentioned is not Lewis acid?
(A) HCl
(B) BF3
(C) AlCl3
(D) Cl

38. : Which of the mentioned is not Lewis base?
(A) NH3
(B) H₂O
(C) Pyridine
(D) BF3

39. : Which of the mentioned is not base according to Lux-Flood concept?
(A) CaO
(B) MgO
(C) PbO
(D) SiO2

40. : Which of the mentioned is not acid according to Lux-Flood concept?
(A) CaO
(B) CO2
(C) SO3
(D) SiO2

41. : Which of the mentioned is not soft base according SHAB concept?
(A) F
(B) CN-
(C) H
(D) R

42. : Which of the mentioned is not hard base according SHAB concept?
(A) NH3
(B) N2H4
(C) RNH2
(D) F