Introduction and concepts of acids and bases MCQs || 10th Chemistry Chapter 10

Introduction and concepts of acids and bases MCQs || 10th Chemistry Chapter 10

1. What substance is produced by taking an alkaline medicine to treat acidity?
A) Acid
B) Salt
C) Base
D) Water

2. What type of taste do acids generally have?
A) Sweet
B) Sour
C) Bitter
D) Salty

3. Which of the following turns blue litmus red?
A) Bases
B) Acids
C) Salts
D) Water

4. What is the main constituent of all acids according to Davy’s discovery?
A) Oxygen
B) Hydrogen
C) Nitrogen
D) Sulfur

5. What happens when metallic oxides dissolve in water?
A) They turn red litmus blue
B) They turn blue litmus red
C) They become acidic
D) They become neutral

6. What is the first acid known to humans?
A) Nitric acid
B) Sulphuric acid
C) Hydrochloric acid
D) Acetic acid

7. Which concept defines acids as substances that give H+ ions in water?
A) Lewis
B) Arrhenius
C) Bronsted-Lowry
D) Davy

8. Which base dissociates in water to give OH- ions?
A) HCl
B) NaOH
C) H2SO4
D) CO2

9. Which of the following is a limitation of the Arrhenius concept?
A) Only applies to aqueous medium
B) Cannot explain acidic behavior
C) Does not define acids
D) Only applies to gases

10. Who discovered that some acids do not contain oxygen?
A) Lavoisier
B) Arrhenius
C) Davy
D) Bronsted

11. Which theory defines acids as proton donors?
A) Arrhenius
B) Lewis
C) Davy
D) Bronsted-Lowry

12. Which of the following is an example of an amphoteric substance?
A) HCl
B) H2O
C) NaOH
D) H2SO4

13. In the reaction of HCl and H2O, what is the conjugate base of HCl?
A) H3O+
B) Cl-
C) OH-
D) H2O

14. What is the conjugate acid of H2O?
A) H+
B) H3O+
C) OH-
D) Cl-

15. Which of the following substances can act as both a Bronsted acid and base?
A) HCl
B) H2SO4
C) H2O
D) NaOH

16. Which theory defines acids as electron pair acceptors?
A) Arrhenius
B) Bronsted-Lowry
C) Lewis
D) Davy

17. Which of the following is an example of a Lewis acid?
A) NH3
B) H+
C) Cl-
D) OH-

18. What is the product of a Lewis acid-base reaction?
A) Salt and water
B) Conjugate acid-base pair
C) Adduct
D) Neutral compound

19. What kind of substances are Lewis bases?
A) Substances that accept protons
B) Substances that donate electron pairs
C) Substances that donate protons
D) Substances that accept electron pairs

20. Which of the following species can act as a Lewis base?
A) H+
B) BF3
C) Na+
D) OH-

21. What is a limitation of the Bronsted-Lowry concept?
A) Does not explain acid behavior in non-aqueous mediums
B) Cannot explain substances like NH3
C) Limited to electron acceptors
D) Only applies to water

22. What concept is based on proton transfer?
A) Lewis
B) Bronsted-Lowry
C) Arrhenius
D) Lavoisier

23. Which substance is a conjugate base of H2SO4?
A) H3O+
B) HSO4-
C) OH-
D) SO4-2

24. Which substance can donate a pair of electrons?
A) H2SO4
B) NaOH
C) NH3
D) HCl

25. Which is a characteristic of bases?
A) Sour taste
B) Corrosive
C) Turn red litmus blue
D) Donate protons

26. What is formed when an acid reacts with a base?
A) Water
B) Salt
C) Both A and B
D) Neither A nor B

27. Which theory describes acids and bases using H+ and OH- ions?
A) Bronsted-Lowry
B) Arrhenius
C) Lewis
D) Davy

28. Which substance is an example of a Bronsted-Lowry base?
A) HCl
B) NH3
C) H2SO4
D) CO2

29. Which of the following is a Lewis acid but not a Bronsted acid?
A) HCl
B) NH3
C) BF3
D) H2SO4

30. What type of reaction occurs when an acid and base exchange a proton?
A) Lewis reaction
B) Bronsted-Lowry reaction
C) Arrhenius reaction
D) Neutralization reaction

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Correct Answers:

1. B
2. B
3. B
4. B
5. A
6. D
7. B
8. B
9. A
10. C
11. D
12. B
13. B
14. B
15. C
16. C
17. B
18. C
19. B
20. D
21. A
22. B
23. B
24. C
25. C
26. C
27. B
28. B
29. C
30. B