Classification of Inorganic Compounds

1. Which of the following is NOT an inorganic compound?

a) NaCl

b) H₂SO₄

c) CH₄

d) CaO

2. Which of the following is an example of a salt?

a) HCl

b) NaOH

c) NaCl

d) NH₃

3. What type of inorganic compound is SO₂?

a) Acidic oxide

b) Basic oxide

c) Neutral oxide

d) Amphoteric oxide

4. The main difference between organic and inorganic compounds is the presence of:

a) Hydrogen

b) Oxygen

c) Carbon

d) Nitrogen

Types of Oxides

5. Which of the following oxides is acidic?

a) Na₂O
b) SO₂

c) MgO

d) Fe₂O₃

6. Amphoteric oxides react with both:

a) Metals and nonmetals

b) Acids and bases

c) Oxygen and nitrogen

d) Water and carbon dioxide

7. Which of the following is a neutral oxide?

a) CO

b) NO₂

c) SO₃

d) P₂O₅

Arrhenius Concept of Acids and Bases

8. According to Arrhenius, an acid is a substance that increases the concentration of:

a) OH⁻ ions in solution

b) H⁺ ions in solution

c) Na⁺ ions in solution

d) Cl⁻ ions in solution

9. Which of the following is an Arrhenius base?

a) HCl

b) H₂SO₄

c) NaOH

d) CO₂
Classification of Acids and Salts

10. A diprotic acid is one that:

a) Can donate one proton

b) Can donate two protons

c) Can donate three protons

d) Does not donate protons

11. What type of salt is NaHSO₄?

a) Normal salt

b) Acidic salt

c) Basic salt

d) Neutral salt

12. A salt that absorbs water from the air and dissolves in it is called:

a) Hygroscopic

b) Efflorescent

c) Deliquescent

d) Neutral

General Properties, Preparation, and Uses

13. Which of the following acids is commonly used in car batteries?

a) HNO₃

b) H₂SO₄

c) HCl

d) CH₃COOH

14. Which base is used in soap making?

a) NaOH
b) Ca(OH)₂

c) NH₄OH

d) Al(OH)₃

15. Which of the following salts is used as table salt?

a) Na₂CO₃

b) NaCl

c) KNO₃

d) CaSO₄

Strong vs. Weak Acids and Base

16. Which of the following is a strong acid?

a) HCl

b) CH₃COOH

c) H₂CO₃

d) NH₄OH

17. Which of the following is a weak base?

a) NaOH

b) KOH

c) NH₄OH

d) Ba(OH)₂

18. Which statement is TRUE about a weak acid?

a) It completely dissociates in water

b) It does not donate protons

c) It partially dissociates in water

d) It has a high pH

Concentrated vs. Dilute Acids and Bases

a) More solute in a given volume of solvent

b) A low percentage of acid in solution

c) Only weak acid molecules

d) A lower pH than a strong acid

20. Which of the following is a dilute acid?

a) 1 M HCl

b) 10 M HCl

c) 98% H₂SO₄

d) Fuming HNO₃

Corrosive Nature and Safety Precautions

21. Acids and bases are corrosive because they can:

a) Neutralize each other

b) Dissolve metals and organic tissues

c) Change color of indicators

d) Produce salts when mixed

22. When working with acids and bases, you should:

a) Wear gloves and goggles

b) Always taste to check pH

c) Store acids with bases

d) Dilute acids by adding water to acid

pH and Acid-Base Identification

23. A solution with a pH of 3 is:

a) Strongly acidic

b) Weakly acidic
c) Neutral

d) Basic

24. Which indicator is commonly used to test for acids and bases?

a) Bromine

b) Phenolphthalein

c) Mercury

d) Lead nitrate

25. What is the pH of a neutral solution?

a) 0

b) 7

c) 10

d) 14

Identification of Acidic, Basic, and Neutral Compounds

26. Which of the following is a neutral compound?

a) NaOH

b) HCl

c) NaCl

d) NH₄OH

27. A substance that turns red litmus paper blue is:

a) An acid

b) A base

c) A salt

d) A neutral compound

28. Which of the following substances has a pH greater than 7?

a) Vinegar
b) Lemon juice

c) Soap solution

d) H₂SO₄

29. A solution of NaCl in water is:

a) Acidic

b) Basic

c) Neutral

d) Amphoteric

30. Which gas is released when an acid reacts with a metal?

a) Oxygen

b) Nitrogen

c) Hydrogen

d) Carbon dioxide

Acid-Base Neutralization Reactions

31. What is the product of a reaction between HCl and NaOH?

a) NaCl + H₂O

b) NaCl + O₂

c) NaOH + H₂

d) Na₂O + H₂O

32. Neutralization reactions generally produce:

a) Acid and base

b) Salt and water

c) Metal and acid

d) Hydrogen and oxygen

a) H₂SO₄ + NaOH → Na₂SO₄ + H₂O

b) H₂SO₄ + 2NaOH → Na₂SO₄ + 2H₂O

c) H₂SO₄ + 2NaOH → Na₂O + H₂O

d) H₂SO₄ + NaOH → Na₂SO₄ + H₂

34. Which of the following is a neutralization reaction?

a) HCl + NaOH → NaCl + H₂O

b) Na + HCl → NaCl + H₂

c) CaCO₃ → CaO + CO₂

d) Fe + O₂ → Fe₂O₃

35. What happens to the pH of an acid when a base is added to it?

a) Increases

b) Decreases

c) Stays the same

d) Becomes zero

Common Uses of Acids, Bases, and Salts

36. Which acid is used in the manufacture of fertilizers?

a) Hydrochloric acid

b) Nitric acid

c) Acetic acid

d) Citric acid

37. Which of the following is a common household base?

a) Vinegar

b) Ammonia solution
c) Lemon juice

d) Carbon dioxide

38. Calcium carbonate is commonly used in:

a) Batteries

b) Antacids

c) Fertilizers

d) Explosives

39. Which salt is used in making glass?

a) Na₂CO₃

b) KCl

c) NH₄Cl

d) NaBr

40. Sodium bicarbonate (NaHCO₃) is commonly used in:

a) Soap making

b) Baking

c) Car batteries

d) Explosives

Chemical Properties of Acids and Bases

41. What is the main ion present in acidic solutions?

a) OH⁻

b) H⁺

c) Cl⁻

d) Na⁺

42. Which metal reacts with hydrochloric acid to produce hydrogen gas?

a) Gold
b) Copper

c) Zinc

d) Silver

43. Bases taste:

a) Sour

b) Sweet

c) Bitter

d) Salty

44. What happens when ammonia gas dissolves in water?

a) It forms an acid

b) It forms a base

c) It remains neutral

d) It evaporates immediately

45. Which of the following reacts with both acids and bases?

a) NaCl

b) H₂O

c) Al₂O₃

d) H₂O₂

Comparing Strengths of Acids and Bases

. A strong acid:

Pa) Partially ionizes in solution

b) Completely ionizes in solution

c) Does not ionize at all

d) Reacts only with strong bases

47. Which of the following acids is stronger?

a) H₂CO₃

b) HCl

c) CH₃COOH

d) H₂O

48. A strong base will have a pH:

a) Close to 0

b) Close to 7

c) Close to 14

d) Close to -1

49. Which of the following is a weak acid?

a) H₂SO₄

b) HCl

c) CH₃COOH

d) HNO₃

50. Which of the following is a strong base?

a) NH₄OH

b) NaOH

c) H₂CO₃

d) HCl

Acid-Base Indicators

51. Phenolphthalein is:

a) Colorless in acids and pink in bases

b) Red in acids and blue in bases

d) Colorless in all solutions

52. Methyl orange is used to test for:

a) Bases

b) Acids

c) Neutral compounds

d) Salts

54. What color does litmus paper turn in acidic solutions?

a) Blue

b) Red

c) Green

d) Yellow

56. What is the best way to test whether a solution is acidic or basic?

a) Smelling it

b) Tasting it

c) Using litmus paper

d) Shaking it

57. What happens when an acid reacts with a carbonate?

a) Oxygen gas is released

b) Carbon dioxide gas is released

c) Hydrogen gas is released

d) Water is released

58. What is the best indicator to use for identifying a weak acid?

a) Litmus paper

b) Universal indicator
c) Methyl orange

d) Bromothymol blue

59. What laboratory equipment is used to measure the pH of a solution accurately?

a) Bunsen burner

b) pH meter

c) Beaker

d) Test tube

Acid-Base Reactions with Metals and Carbonates

61. Which gas is released when a metal reacts with an acid?

a) Oxygen

b) Nitrogen

c) Hydrogen

d) Carbon dioxide

62. Which of the following metals does NOT react with an acid?

a) Sodium

b) Zinc

c) Copper

d) Iron

63. The reaction between HCl and CaCO₃ produces:

a) CO₂, CaCl₂, and H₂O

b) H₂, CaCl₂, and O₂

c) CO₂, H₂O, and NaCl

d) H₂ and O₂

64. What happens when an acid is added to limestone (CaCO₃)?

a) Bubbles of CO₂ are observed

c) A metal is deposited

d) The limestone dissolves instantly

65. Which of the following bases reacts with an acid to form ammonia?

a) NaOH

b) KOH

c) NH₄OH

d) Ba(OH)₂

Balancing Acid-Base Reaction

66. What is the balanced equation for the reaction of NaOH with H₂SO₄?

a) NaOH + H₂SO₄ → Na₂SO₄ + H₂O

b) 2NaOH + H₂SO₄ → Na₂SO₄ + 2H₂O

c) NaOH + H₂SO₄ → NaHSO₄ + H₂O

d) 2NaOH + H₂SO₄ → Na₂O + 2H₂O

67. The balanced equation for the reaction of calcium hydroxide with hydrochloric acid is:

a) Ca(OH)₂ + HCl → CaCl₂ + H₂O

b) Ca(OH)₂ + 2HCl → CaCl₂ + 2H₂O

c) Ca(OH)₂ + HCl → CaO + H₂O

d) Ca(OH)₂ + 2HCl → Ca + Cl₂ + H₂

68. When sulfuric acid reacts with sodium carbonate, what are the products?

a) Na₂SO₄ + CO₂ + H₂O

b) Na₂O + CO₂ + H₂O

d) Na₂O + SO₂ + H₂O

69. Which of the following acids reacts with NaOH to form NaNO₃ and H₂O?

a) HCl

b) H₂SO₄

c) HNO₃

d) H₃PO₄

70. Which of the following represents a neutralization reaction?

a) CO₂ + H₂O → H₂CO₃

b) NaOH + HCl → NaCl + H₂O

c) Fe + O₂ → Fe₂O₃

d) C + O₂ → CO₂

Application of Acids and Bases in Daily Life

71. Which acid is present in vinegar?

a) HCl

b) HNO₃

c) CH₃COOH

d) H₂SO₄

72. Which base is used in antacids to neutralize stomach acid?

a) NaOH

b) Ca(OH)₂

c) Mg(OH)₂

d) NH₄OH

74. The sour taste of citrus fruits is due to the presence of:
a) Sulfuric acid

b) Hydrochloric acid

c) Citric acid

d) Phosphoric acid

Safety Measures for Handling Acids and Bases

76. If acid spills on your skin, what should you do?

a) Wash with water immediately

b) Apply baking soda

c) Wipe with a dry cloth

d) Neutralize with a base

77. When diluting a concentrated acid, you should:

a) Add acid to water

b) Add water to acid

c) Mix both at the same time

d) Shake the container vigorously

Multiple-Choice Questions on Salts

1. What is a salt in chemistry?

a) A compound formed by the reaction of an acid and a base

b) A metal mixed with a non-metal

c) A compound with a pH of 7

d) A substance that dissolves in water

2. Which of the following is an example of a salt?

a) HCl

b) NaOH

c) NaCl
d) NH₃

3. What type of salt is formed when a strong acid reacts with a strong base?

a) Acidic salt

b) Basic salt

c) Neutral salt

d) Double salt

4. Which of the following salts is commonly known as baking soda?

a) NaCl

b) Na₂CO₃

c) NaHCO₃

d) K₂SO₄

5. Which salt is used as table salt?

a) NaNO₃

b) Na₂CO₃

c) NaCl

d) KCl

6. Which of the following salts is used in fertilizers?

a) NH₄NO₃

b) NaCl

c) NaHCO₃

d) CaCO₃

7. A salt formed from a weak acid and a strong base is:

a) Neutral

b) Acidic

c) Basic
d) Amphoteric

8. What happens when a salt dissolves in water?

a) It forms a precipitate

b) It dissociates into ions

c) It forms a gas

d) It reacts violently

9. Which of the following salts is insoluble in water?

a) NaCl

b) KNO₃

c) AgCl

d) NH₄Cl

10. What is the process of obtaining salt from seawater called?

a) Sublimation

b) Precipitation

c) Evaporation

d) Filtration

11. Which of the following salts is commonly used in making glass?

a) Na₂CO₃

b) NaCl

c) NH₄Cl

d) NaHCO₃

12. Which of the following salts absorbs moisture from the air and dissolves in it?

a) Efflorescent

b) Deliquescent

c) Hygroscopic
d) Neutral

13. When an acid reacts with a metal carbonate, the salt formed is accompanied by the release of:

a) Hydrogen gas

b) Oxygen gas

c) Carbon dioxide

d) Chlorine gas

14. Which of the following salts is used in food preservation?

a) NaCl

b) Na₂CO₃

c) KNO₃

d) NH₄Cl

15. The pH of a solution of NaCl in water is:

a) Less than 7

b) Equal to 7

c) Greater than 7

d) Depends on temperature

16. What type of salt is formed when a strong acid reacts with a weak base?

a) Neutral salt

b) Acidic salt

c) Basic salt

d) Double salt

d) NaCl

18. What happens when NaCl is added to water?

a) It remains undissolved

b) It forms a precipitate
c) It dissociates into Na⁺ and Cl⁻ ions

d) It produces a gas