1. An acid is a substance that produces ______ in aqueous solution.
A) OH⁻ ions
B) H⁺ ions
C) O²⁻ ions
D) Na⁺ ions
Answer: B) H⁺ ions
2. The pH value of an acidic solution is always:
A) Greater than 7
B) Equal to 7
C) Less than 7
D) Equal to 14
Answer: C) Less than 7
3. Which of the following is a strong acid?
A) Acetic acid
B) Carbonic acid
C) Hydrochloric acid
D) Citric acid
Answer: C) Hydrochloric acid
4. The chemical formula of sulfuric acid is:
A) HCl
B) H₂SO₄
C) HNO₃
D) H₂CO₃
Answer: B) H₂SO₄
5. Which indicator turns red in acidic solution?
A) Phenolphthalein
B) Methyl orange
C) Blue litmus
D) Turmeric
Answer: C) Blue litmus
6. Acids taste:
A) Bitter
B) Sweet
C) Sour
D) Salty
Answer: C) Sour
7. Which acid is present in lemon?
A) Lactic acid
B) Citric acid
C) Acetic acid
D) Formic acid
Answer: B) Citric acid
8. Nitric acid is represented by the formula:
A) HNO₂
B) HNO₃
C) NH₃
D) NO₂
Answer: B) HNO₃
9. Which gas is produced when an acid reacts with a metal?
A) Oxygen
B) Nitrogen
C) Hydrogen
D) Carbon dioxide
Answer: C) Hydrogen
10. Acids react with bases to form:
A) Only water
B) Only salt
C) Salt and water
D) Gas and water
Answer: C) Salt and water
11. The reaction between acid and base is called:
A) Oxidation
B) Reduction
C) Neutralization
D) Combustion
Answer: C) Neutralization
12. Which acid is found in vinegar?
A) Citric acid
B) Acetic acid
C) Formic acid
D) Sulfuric acid
Answer: B) Acetic acid
13. Which of the following is a weak acid?
A) HCl
B) H₂SO₄
C) HNO₃
D) CH₃COOH
Answer: D) CH₃COOH
14. The acid present in car batteries is:
A) Hydrochloric acid
B) Nitric acid
C) Sulfuric acid
D) Carbonic acid
Answer: C) Sulfuric acid
15. Which acid is also known as aqua fortis?
A) Nitric acid
B) Hydrochloric acid
C) Sulfuric acid
D) Acetic acid
Answer: A) Nitric acid
16. When an acid reacts with a carbonate, it produces:
A) Salt and hydrogen
B) Salt, water and carbon dioxide
C) Salt and oxygen
D) Water and hydrogen
Answer: B) Salt, water and carbon dioxide
17. Which acid is present in sour milk?
A) Citric acid
B) Lactic acid
C) Tartaric acid
D) Formic acid
Answer: B) Lactic acid
18. The strength of an acid depends on its:
A) Color
B) Taste
C) Concentration of H⁺ ions
D) Smell
Answer: C) Concentration of H⁺ ions
19. Which of the following acids is diprotic?
A) HCl
B) HNO₃
C) H₂SO₄
D) HCOOH
Answer: C) H₂SO₄
20. An acid that contains oxygen is called:
A) Binary acid
B) Oxyacid
C) Organic acid
D) Mineral acid
Answer: B) Oxyacid
21. Which acid is used in soft drinks?
A) Sulfuric acid
B) Carbonic acid
C) Nitric acid
D) Hydrochloric acid
Answer: B) Carbonic acid
22. Acids turn phenolphthalein indicator:
A) Pink
B) Blue
C) Colorless
D) Green
Answer: C) Colorless
23. Which acid is secreted in the human stomach?
A) Nitric acid
B) Sulfuric acid
C) Hydrochloric acid
D) Carbonic acid
Answer: C) Hydrochloric acid
24. The formula of phosphoric acid is:
A) H₃PO₄
B) H₃PO₃
C) HPO₄
D) P₂O₅
Answer: A) H₃PO₄
25. Which of the following is a natural acid?
A) Sulfuric acid
B) Nitric acid
C) Citric acid
D) Hydrochloric acid
Answer: C) Citric acid
26. Acids are generally corrosive because they:
A) Produce OH⁻ ions
B) Release H⁺ ions
C) Absorb water
D) Produce nitrogen
Answer: B) Release H⁺ ions
27. Which acid is known as oil of vitriol?
A) Hydrochloric acid
B) Nitric acid
C) Sulfuric acid
D) Acetic acid
Answer: C) Sulfuric acid
28. The reaction of an acid with a base produces heat. This type of reaction is:
A) Endothermic
B) Exothermic
C) Reversible
D) Slow
Answer: B) Exothermic
29. Which acid is used in the manufacture of fertilizers?
A) Sulfuric acid
B) Nitric acid
C) Both A and B
D) Acetic acid
Answer: C) Both A and B
30. An acid that completely ionizes in water is called a:
A) Weak acid
B) Strong acid
C) Organic acid
D) Dilute acid
Answer: B) Strong acid