Acids bases and salts - Question Bank

1. The indicator methyl orange is red in acidic solutions, yellow in basic solutions, and orange in neutral solutions. This makes it suitable for titrating:
A) A strong acid with a strong base
B) A strong acid with a weak base
C) A weak acid with a strong base
D) A weak acid with a weak base
2. Which acid is present in sour milk?
A) Citric acid
B) Malic acid
C) Lactic acid
D) Oxalic acid
3. The process of dissolving a salt in water can result in a solution that is acidic, basic, or neutral depending on the nature of the parent acid and base. This is known as:
A) Hydrolysis of salts
B) Neutralization
C) Dissociation
D) Ionization
4. Which of the following is a neutral salt?
A) Sodium acetate
B) Ammonium chloride
C) Potassium nitrate
D) Copper sulfate
5. What is the pH of a strong base solution?
A) Around 7
B) Between 0 and 3
C) Between 11 and 14
D) Exactly 7
6. Which substance is used to neutralize excess acid in the stomach?
A) Vinegar
B) Baking soda
C) Salt water
D) Sugar
7. The reaction of an acid with a metal carbonate produces:
A) Salt and water
B) Salt, water, and carbon dioxide
C) Salt and hydrogen gas
D) Salt and oxygen gas
8. What is the chemical formula for calcium carbonate?
A) CaO
B) Ca(OH)2
C) CaCO3
D) CaCl2
9. Which of the following is a basic salt?
A) Ammonium chloride
B) Sodium bisulfate
C) Sodium carbonate
D) Potassium nitrate
10. A solution that resists changes in pH when small amounts of acid or base are added is called a:
A) Neutral solution
B) Buffer solution
C) Concentrated solution
D) Dilute solution
11. Which acid is responsible for the sting of an ant?
A) Acetic acid
B) Citric acid
C) Formic acid
D) Lactic acid
12. What is the common name for sodium hydroxide?
A) Baking soda
B) Caustic soda
C) Washing soda
D) Quicklime
13. The chemical formula for carbonic acid is:
A) H2CO3
B) HCOOH
C) CH3COOH
D) H2SO4
14. Which metal reacts with dilute hydrochloric acid to produce hydrogen gas?
A) Copper
B) Silver
C) Mercury
D) Zinc
15. What is the primary function of salts in biological systems?
A) Energy storage
B) Catalysis of reactions
C) Maintaining fluid balance and nerve impulse transmission
D) Building muscle tissue
16. Which of the following is a salt of a strong acid and a strong base?
A) Ammonium chloride
B) Sodium acetate
C) Sodium chloride
D) Copper sulfate
17. What is the pH of a strong acid solution?
A) Around 7
B) Between 0 and 3
C) Between 4 and 6
D) Above 7
18. The characteristic property of a base that it feels soapy to touch is due to:
A) Its reaction with skin oils
B) Its high viscosity
C) Its ionic nature
D) Its ability to dissolve in water
19. Which acid is used in the manufacture of fertilizers?
A) Hydrochloric acid
B) Nitric acid
C) Sulfuric acid
D) Phosphoric acid
20. The chemical formula for slaked lime is:
A) CaO
B) Ca(OH)2
C) CaCO3
D) CaCl2
21. Which of the following is a natural indicator obtained from lichens?
A) Phenolphthalein
B) Methyl orange
C) Litmus
D) Turmeric
22. The point at which the acid and base have completely neutralized each other in a titration is known as the:
A) Endpoint
B) Equivalence point
C) Indicator point
D) Buffer point
23. The process of adding a base to an acid (or vice versa) to determine its concentration is called:
A) Titration
B) Distillation
C) Filtration
D) Evaporation
24. Which gas is primarily responsible for acid rain?
A) Carbon dioxide
B) Nitrogen dioxide and sulfur dioxide
C) Oxygen
D) Methane
25. The pH of acid rain is typically:
A) Greater than 7
B) Equal to 7
C) Less than 5.6
D) Exactly 7
26. A basic salt is formed when:
A) A strong acid reacts with a strong base
B) A weak acid reacts with a strong base
C) A strong acid reacts with a weak base
D) A weak acid reacts with a weak base
27. Which of the following is an acidic salt?
A) Sodium chloride
B) Sodium sulfate
C) Sodium bisulfate
D) Sodium carbonate
28. Quicklime is the common name for:
A) Calcium hydroxide
B) Calcium carbonate
C) Calcium oxide
D) Calcium chloride
29. What is the common name for calcium hydroxide?
A) Quicklime
B) Slaked lime
C) Caustic soda
D) Soda ash
30. The sour taste of curd is due to the presence of which acid?
A) Acetic acid
B) Citric acid
C) Lactic acid
D) Oxalic acid
31. Which acid is used in lead-acid batteries?
A) Hydrochloric acid
B) Nitric acid
C) Sulfuric acid
D) Phosphoric acid
32. Washing soda is chemically known as:
A) Sodium bicarbonate
B) Sodium chloride
C) Sodium hydroxide
D) Sodium carbonate decahydrate
33. What is the chemical name for baking soda?
A) Sodium chloride
B) Sodium carbonate
C) Sodium bicarbonate
D) Potassium nitrate
34. Phenolphthalein is colorless in acidic solutions and pink in basic solutions. This property makes it useful as a:
A) pH indicator
B) Drying agent
C) Catalyst
D) Solvent
35. Which indicator turns red in acidic solutions and blue in basic solutions?
A) Phenolphthalein
B) Methyl orange
C) Litmus
D) Thymol blue
36. The pH of pure water at 25°C is:
A) 0
B) 7
C) 14
D) 1
37. Which gas is produced when a metal reacts with an acid?
A) Oxygen
B) Carbon dioxide
C) Hydrogen
D) Nitrogen
38. What is the main component of antacids used to relieve indigestion?
A) Sodium bicarbonate
B) Magnesium hydroxide
C) Aluminum hydroxide
D) All of the above
39. Which of the following is an example of an amphoteric substance?
A) Sodium chloride
B) Water
C) Sulfuric acid
D) Ammonia
40. Lemon juice is sour due to the presence of which acid?
A) Malic acid
B) Ascorbic acid
C) Tartaric acid
D) Citric acid
41. Which acid is found in vinegar?
A) Citric acid
B) Lactic acid
C) Acetic acid
D) Formic acid
42. What is the chemical formula for common salt (sodium chloride)?
A) NaCl
B) HCl
C) NaOH
D) H2O
43. The reaction between an acid and a base is called:
A) Oxidation
B) Reduction
C) Neutralization
D) Combustion
44. When an acid reacts with a base, what are the typical products formed?
A) Salt and water
B) Hydrogen gas and oxygen gas
C) Carbon dioxide and water
D) Salt and hydrogen gas
45. Which of the following is a weak base?
A) Sodium hydroxide
B) Potassium hydroxide
C) Ammonium hydroxide
D) Calcium hydroxide
46. Which of the following is a strong acid?
A) Acetic acid
B) Carbonic acid
C) Hydrochloric acid
D) Citric acid
47. A solution with a pH of 7 is considered to be:
A) Acidic
B) Basic
C) Neutral
D) Strongly acidic
48. What is the pH range for acidic solutions?
A) pH < 7
B) pH = 7
C) pH > 7
D) pH = 0
49. Bases typically exhibit which of the following properties?
A) They taste sour
B) They have a pH greater than 7
C) They turn blue litmus paper red
D) They react with metals to produce hydrogen gas
50. Which of the following is a characteristic property of acids?
A) They taste bitter
B) They feel soapy to touch
C) They turn red litmus paper blue
D) They turn blue litmus paper red
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