MCQ on Acids, Bases and Salts – CBSE Class 10
1. Which of the following is an acid?
A) NaOH
B) HCl
C) NaCl
D) CaO
Answer: HCl
2. Which of the following is a base?
A) H₂SO₄
B) HNO₃
C) NaOH
D) NaCl
Answer: NaOH
3. Which substance is used to test acids?
A) Blue litmus
B) Red litmus
C) Phenolphthalein
D) Methyl orange
Answer: Blue litmus
4. Which of the following turns blue litmus red?
A) Salt
B) Base
C) Acid
D) Alcohol
Answer: Acid
5. Which of the following turns red litmus blue?
A) Acid
B) Base
C) Salt
D) Water
Answer: Base
6. What do all acids have in common?
A) OH⁻ ions
B) H⁺ ions
C) Na⁺ ions
D) Cl⁻ ions
Answer: H⁺ ions
7. What do all bases have in common?
A) H⁺ ions
B) OH⁻ ions
C) Cl⁻ ions
D) Na⁺ ions
Answer: OH⁻ ions
8. Which acid is present in lemon?
A) Acetic acid
B) Citric acid
C) Lactic acid
D) Tartaric acid
Answer: Citric acid
9. Which acid is present in curd?
A) Acetic acid
B) Citric acid
C) Lactic acid
D) Oxalic acid
Answer: Lactic acid
10. Which acid is present in vinegar?
A) Citric acid
B) Acetic acid
C) Lactic acid
D) Formic acid
Answer: Acetic acid
11. Which acid is present in ant’s sting?
A) Acetic acid
B) Formic acid
C) Oxalic acid
D) Citric acid
Answer: Formic acid
12. Which of the following is a strong acid?
A) Acetic acid
B) Carbonic acid
C) Hydrochloric acid
D) Citric acid
Answer: Hydrochloric acid
13. Which of the following is a weak acid?
A) HCl
B) HNO₃
C) CH₃COOH
D) H₂SO₄
Answer: Acetic acid
14. Which base is present in milk of magnesia?
A) Sodium hydroxide
B) Potassium hydroxide
C) Magnesium hydroxide
D) Calcium hydroxide
Answer: Magnesium hydroxide
15. What is the pH value of a neutral solution?
A) 1
B) 7
C) 10
D) 14
Answer: 7
16. Which solution has pH less than 7?
A) Acidic solution
B) Basic solution
C) Neutral solution
D) Salt solution
Answer: Acidic solution
17. Which solution has pH more than 7?
A) Acid
B) Base
C) Salt
D) Distilled water
Answer: Base
18. Which acid is present in the stomach?
A) Sulphuric acid
B) Nitric acid
C) Hydrochloric acid
D) Acetic acid
Answer: Hydrochloric acid
19. Which substance is used to treat acidity in the stomach?
A) Sodium chloride
B) Sodium bicarbonate
C) Hydrochloric acid
D) Ammonium chloride
Answer: Sodium bicarbonate
20. What is baking soda?
A) Sodium carbonate
B) Sodium bicarbonate
C) Calcium carbonate
D) Potassium carbonate
Answer: Sodium bicarbonate
21. What is the chemical name of washing soda?
A) Sodium bicarbonate
B) Sodium carbonate
C) Calcium carbonate
D) Sodium chloride
Answer: Sodium carbonate
22. Washing soda has the chemical formula
A) Na₂CO₃
B) NaHCO₃
C) CaCO₃
D) NaCl
Answer: Na₂CO₃
23. Which salt is used in making glass and soap?
A) Baking soda
B) Washing soda
C) Common salt
D) Bleaching powder
Answer: Washing soda
24. What is common salt?
A) Sodium carbonate
B) Sodium bicarbonate
C) Sodium chloride
D) Calcium chloride
Answer: Sodium chloride
25. Which salt is obtained from sea water?
A) Sodium carbonate
B) Sodium chloride
C) Sodium bicarbonate
D) Ammonium chloride
Answer: Sodium chloride
26. Which chemical is used to disinfect drinking water?
A) Baking soda
B) Washing soda
C) Bleaching powder
D) Common salt
Answer: Bleaching powder
27. Bleaching powder is prepared from
A) Calcium carbonate
B) Calcium hydroxide
C) Sodium hydroxide
D) Sodium carbonate
Answer: Calcium hydroxide
28. Which gas is released when acid reacts with metal carbonate?
A) Oxygen
B) Hydrogen
C) Carbon dioxide
D) Nitrogen
Answer: Carbon dioxide
29. What happens when an acid reacts with a base?
A) Gas is formed
B) Salt and water are formed
C) Only water is formed
D) Only salt is formed
Answer: Salt and water are formed
30. What is this reaction called?
A) Combination
B) Neutralisation
C) Displacement
D) Decomposition
Answer: Neutralisation
31. Which acid is present in tomato?
A) Acetic acid
B) Oxalic acid
C) Citric acid
D) Lactic acid
Answer: Oxalic acid
32. Which base is present in soap?
A) Sodium hydroxide
B) Calcium hydroxide
C) Ammonium hydroxide
D) Magnesium hydroxide
Answer: Sodium hydroxide
33. Which salt is used for making bread and cakes soft?
A) Washing soda
B) Baking soda
C) Bleaching powder
D) Common salt
Answer: Baking soda
34. What is plaster of Paris chemically?
A) Calcium sulphate
B) Calcium carbonate
C) Calcium sulphate hemihydrate
D) Calcium hydroxide
Answer: Calcium sulphate hemihydrate
35. Plaster of Paris is prepared from
A) Gypsum
B) Limestone
C) Baking soda
D) Washing soda
Answer: Gypsum
36. What is the chemical formula of Plaster of Paris?
A) CaSO₄
B) CaSO₄·2H₂O
C) CaSO₄·½H₂O
D) CaCO₃
Answer: CaSO₄·½H₂O
37. Which salt is used to remove permanent hardness of water?
A) Sodium carbonate
B) Sodium chloride
C) Sodium bicarbonate
D) Calcium carbonate
Answer: Sodium carbonate
38. Which salt is used in fire extinguishers?
A) Sodium carbonate
B) Sodium bicarbonate
C) Sodium chloride
D) Calcium carbonate
Answer: Sodium bicarbonate
39. Which indicator turns pink in a basic solution?
A) Litmus
B) Methyl orange
C) Phenolphthalein
D) Turmeric
Answer: Phenolphthalein
40. Which indicator turns red in an acidic solution?
A) Phenolphthalein
B) Methyl orange
C) Turmeric
D) China rose
Answer: Methyl orange
41. Which of the following is a natural indicator?
A) Litmus
B) Phenolphthalein
C) Methyl orange
D) Sodium hydroxide
Answer: Litmus
42. Which salt is used to make cement hard quickly?
A) Calcium chloride
B) Sodium chloride
C) Sodium carbonate
D) Baking soda
Answer: Calcium chloride
43. Which acid is used in car batteries?
A) Hydrochloric acid
B) Nitric acid
C) Sulphuric acid
D) Acetic acid
Answer: Sulphuric acid
44. What happens when a base reacts with a metal?
A) Salt and water are formed
B) Hydrogen gas is evolved
C) Carbon dioxide is released
D) Oxygen is released
Answer: Hydrogen gas is evolved
45. Which salt is used for cleaning purposes?
A) Sodium bicarbonate
B) Sodium carbonate
C) Calcium carbonate
D) Sodium chloride
Answer: Sodium carbonate
46. What is the nature of baking soda solution?
A) Acidic
B) Neutral
C) Basic
D) Salty
Answer: Basic
47. Which compound is used to prepare bleaching powder?
A) Calcium carbonate
B) Calcium hydroxide
C) Sodium hydroxide
D) Sodium chloride
Answer: Calcium hydroxide
48. Which salt is used to preserve food?
A) Washing soda
B) Baking soda
C) Common salt
D) Bleaching powder
Answer: Common salt
49. Which acid is present in soft drinks?
A) Acetic acid
B) Carbonic acid
C) Citric acid
D) Oxalic acid
Answer: Carbonic acid
50. Which salt is known as hydrated sodium carbonate?
A) Washing soda
B) Baking soda
C) Bleaching powder
D) Plaster of Paris
Answer: Washing soda
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