MCQs – Acids, Bases and Salts (Science -Class 10)

MCQs – Acids, Bases and Salts (Class 10)

1. The substance which tastes sour is:
A. Water
B. Lemon juice
C. Milk
D. Soap solution
Answer: B

2. Which ions do acids produce in water?
A. OH⁻
B. H⁺
C. Cl⁻
D. H₃O⁺
Answer: D

3. Which element is common to all acids?
A. Hydrogen
B. Oxygen
C. Sodium
D. Carbon
Answer: A

4. The pH of an acidic solution is:
A. Less than 7
B. More than 7
C. 7
D. 10
Answer: A

5. When a base reacts with a non-metal oxide, the products are:
A. Acid
B. Salt + Water
C. Salt + Acid
D. Salt + Base
Answer: B

6. Chemical formula of Plaster of Paris is:
A. CaCO₃
B. CaSO₄·½H₂O
C. Ca(OH)₂
D. CaSO₄
Answer: B

7.թ An example of a mild base is:
A. Lime water
B. Baking soda
C. Window cleaner
D. NaOH
Answer: B

8. Which of the following is a strong acid?
A. Acetic acid
B. Citric acid
C. Hydrochloric acid
D. Carbonic acid
Answer: C

9. What is the pH of a neutral solution at 25°C?
A. 0
B. 7
C. 14
D. 1
Answer: B

10. Which substance is used for whitewashing walls?
A. Calcium carbonate
B. Calcium hydroxide
C. Calcium chloride
D. Calcium sulphate
Answer: B

11. The pH of lemon juice is around:
A. 1–2
B. 4–5
C. 7
D. 9–10
Answer: A

12. Which compound is used in baking cakes?
A. Washing soda
B. Baking soda
C. Bleaching powder
D. Plaster of Paris
Answer: B

13. Tooth decay starts when the pH of the mouth is below:
A. 5.5
B. 7
C. 8
D. 9
Answer: A

14. Milk of magnesia is:
A. Calcium hydroxide
B. Sodium hydroxide
C. Magnesium hydroxide
D. Magnesium carbonate
Answer: C

15. Common salt is chemically:
A. NaBr
B. NaCl
C. Na₂SO₄
D. Na₂CO₃
Answer: B

16. Washing soda is also known as:
A. Sodium chloride
B. Calcium carbonate
C. Sodium carbonate decahydrate
D. Sodium bicarbonate
Answer: C

17. Hardness of water is due to the presence of:
A. Chlorine ions
B. Sodium ions
C. Potassium ions
D. Calcium and magnesium ions
Answer: D

18. When acid reacts with a metal carbonate, it forms:
A. Salt and hydrogen
B. Salt and water
C. Salt, water and carbon dioxide
D. Salt and oxygen
Answer: C

19. Slaked lime is another name of:
A. CaCO₃
B. CaO
C. Ca(OH)₂
D. NaOH
Answer: C

20. Which salt has no effect on litmus paper?
A. Potassium chloride
B. Ammonium chloride
C. Sodium chloride
D. Zinc chloride
Answer: C

21. Which of the following can be used as a natural indicator?
A. Turmeric
B. Methyl orange
C. Phenolphthalein
D. Universal indicator
Answer: A

22. Excessive use of sodium bicarbonate may cause:
A. Acidosis
B. Alkalosis
C. Stomach ulcer
D. Inflammation
Answer: B

23. Sodium carbonate on heating produces:
A. Carbon monoxide
B. Carbon dioxide
C. Oxygen
D. Hydrogen
Answer: B

24. Which of the following bases is not an alkali?
A. Potassium hydroxide
B. Sodium hydroxide
C. Calcium hydroxide
D. Ammonium hydroxide
Answer: D

25. Name the compound used in water softening:
A. Bleaching powder
B. Plaster of Paris
C. Washing soda
D. Lime water
Answer: C

26. The pH of a 1 M HCl solution is approximately:
A. 1
B. 4
C. 7
D. 14
Answer: A

27. The salt formed by the reaction of hydrochloric acid with sodium hydroxide is:
A. Na₂SO₄
B. NaHCO₃
C. NaCl
D. Na₂CO₃
Answer: C

28. Washing soda is chemically:
A. Na₂CO₃
B. NaHCO₃
C. Na₂CO₃·10H₂O
D. NaOH
Answer: C

29. Which salt is called baking soda?
A. Na₂CO₃
B. Na₂CO₃·10H₂O
C. NaHCO₃
D. MgCO₃
Answer: C

30. When an acid reacts with a base, it forms:
A. An acidic salt
B. A basic salt
C. A neutral salt
D. An acidic base
Answer: C

31. Which gas is evolved when an acid reacts with a metal?
A. Hydrogen
B. Oxygen
C. Carbon dioxide
D. Nitrogen
Answer: A

32. Which of the following is used in toothpaste?
A. NaCl
B. Baking soda
C. Washing soda
D. Caustic soda
Answer: B

33. Antacids are generally made of:
A. Mild acids
B. Mild bases
C. Strong bases
D. Strong acids
Answer: B

34. Which salt has no effect on litmus paper?
A. Potassium chloride
B. Ammonium chloride
C. Sodium chloride
D. Zinc chloride
Answer: C

35. Slaked lime is also known as:
A. Calcium carbonate
B. Calcium oxide
C. Calcium hydroxide
D. Sodium hydroxide
Answer: C

36. Which gas is evolved when sodium carbonate reacts with hydrochloric acid?
A. Oxygen
B. Hydrogen
C. Carbon dioxide
D. Nitrogen
Answer: C

37. The common name of CaOCl₂ is:
A. Baking soda
B. Bleaching powder
C. Slaked lime
D. Quick lime
Answer: B

38. Which of the following pairs will give a neutral solution?
A. HCl and NaOH
B. HNO₂ and NaOH
C. CH₃COOH and NaOH
D. H₂SO₄ and NaOH
Answer: A

39. Which compound is known as caustic soda?
A. Na₂CO₃
B. NaHCO₃
C. NaOH
D. Ca(OH)₂
Answer: C

40. Calcium hydroxide is also called:
A. Quick lime
B. Slaked lime
C. Bleaching powder
D. Blue vitriol
Answer: B

41. In the chlor-alkali process, chlorine gas is produced at:
A. Anode
B. Cathode
C. Both electrodes
D. Not produced
Answer: A

42. Which salt is used in the manufacture of glass, soap and paper?
A. Baking soda
B. Washing soda
C. Bleaching powder
D. Plaster of Paris
Answer: B

43. Name the acid present in vinegar:
A. Tartaric acid
B. Acetic acid
C. Citric acid
D. Formic acid
Answer: B

44. Which ion is responsible for the acidic nature of a substance?
A. OH⁻
B. H⁺
C. Na⁺
D. Cl⁻
Answer: B

45. Dry HCl gas does not change the colour of dry litmus paper because:
A. It has no hydrogen
B. It has no chlorine
C. It does not produce H⁺ ions
D. It is a weak acid
Answer: C

46. Which substance is used for whitewashing walls?
A. Calcium carbonate
B. Calcium hydroxide
C. Calcium chloride
D. Calcium sulphate
Answer: B

47. Which salt does not conduct electricity in solid state?
A. Common salt
B. Washing soda
C. Baking soda
D. Ammonium chloride
Answer: A

48. Tooth decay starts when the pH of the mouth falls below:
A. 7.0
B. 6.5
C. 5.5
D. 4.5
Answer: C

49. Which indicator turns pink in basic solution?
A. Methyl orange
B. Litmus
C. Phenolphthalein
D. Turmeric
Answer: C

50. Bleaching powder is produced by the action of chlorine on:
A. Dry Ca(OH)₂
B. Moist Ca(OH)₂
C. CaCO₃
D. CaO
Answer: B

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