Acids, Bases and Salts Part 3: MCQs (Q51–Q75)
⚗️ Acids, Bases and Salts – Class 10 Science MCQs
Part 3: Salts, Their Properties, Preparation & Common Salts (Q51–Q75)
Q51. A salt is formed when:
A. Acid reacts with metal
B. Acid reacts with base
C. Base reacts with oxide
D. Salt reacts with salt
✅ Correct Answer: B. Acid reacts with base
Explanation: Neutralization → Acid + Base → Salt + Water.
Q52. Which salt is called common salt?
A. NaCl
B. KCl
C. CaCl₂
D. Na₂SO₄
✅ Correct Answer: A. NaCl
Q53. The pH of NaCl solution is:
A. Less than 7
B. Greater than 7
C. Exactly 7
D. Cannot be determined
✅ Correct Answer: C. Exactly 7
Explanation: NaCl is a neutral salt formed from strong acid + strong base.
Q54. The raw material for making common salt is:
A. Sea water
B. Limestone
C. Soda ash
D. Rock phosphate
✅ Correct Answer: A. Sea water
Q55. The main source of common salt is:
A. Oceans
B. Lakes
C. Groundwater
D. Rivers
✅ Correct Answer: A. Oceans
Q56. Which salt is used for preservation of food?
A. Na₂CO₃
B. NaCl
C. NaOH
D. CaSO₄
✅ Correct Answer: B. NaCl
Q57. Baking soda is chemically known as:
A. Sodium carbonate
B. Sodium hydrogen carbonate
C. Sodium hydroxide
D. Calcium carbonate
✅ Correct Answer: B. Sodium hydrogen carbonate (NaHCO₃)
Q58. Formula of washing soda is:
A. Na₂CO₃·10H₂O
B. NaHCO₃
C. NaOH
D. NaCl
✅ Correct Answer: A. Na₂CO₃·10H₂O
Q59. Which of the following is used as an antacid?
A. Baking soda
B. Washing soda
C. Bleaching powder
D. NaCl
✅ Correct Answer: A. Baking soda (NaHCO₃)
Q60. The chemical name of bleaching powder is:
A. Calcium oxychloride
B. Calcium carbonate
C. Calcium chloride
D. Sodium hypochlorite
✅ Correct Answer: A. Calcium oxychloride (CaOCl₂)
Q61. Bleaching powder is prepared by reacting chlorine gas with:
A. NaOH
B. Ca(OH)₂
C. CaCl₂
D. NaCl
✅ Correct Answer: B. Ca(OH)₂
Q62. Which of the following is used for disinfecting drinking water?
A. Washing soda
B. Baking soda
C. Bleaching powder
D. Vinegar
✅ Correct Answer: C. Bleaching powder
Q63. Which salt is used in soda-acid fire extinguishers?
A. Washing soda
B. Baking soda
C. NaCl
D. K₂CO₃
✅ Correct Answer: B. Baking soda (NaHCO₃)
Explanation: Releases CO₂ when mixed with acid → extinguishes fire.
Q64. Which substance is used in the manufacture of glass?
A. Washing soda
B. Baking soda
C. Bleaching powder
D. NaCl
✅ Correct Answer: A. Washing soda (Na₂CO₃·10H₂O)
Q65. Which chemical is used to remove hardness of water?
A. NaHCO₃
B. Na₂CO₃·10H₂O
C. NaCl
D. CaO
✅ Correct Answer: B. Na₂CO₃·10H₂O (washing soda)
Q66. Plaster of Paris (POP) is chemically:
A. CaSO₄·2H₂O
B. CaSO₄·½H₂O
C. CaSO₄
D. CaCO₃
✅ Correct Answer: B. CaSO₄·½H₂O
Q67. When Plaster of Paris is mixed with water it sets into:
A. CaSO₄·2H₂O (gypsum)
B. CaSO₄
C. CaCO₃
D. CaCl₂
✅ Correct Answer: A. CaSO₄·2H₂O (gypsum)
Q68. Which salt is used for making statues and decorative materials?
A. Baking soda
B. Washing soda
C. Plaster of Paris
D. NaCl
✅ Correct Answer: C. Plaster of Paris (POP)
Q69. Which salt is used in the preparation of glass, soap and paper?
A. Baking soda
B. Washing soda
C. Bleaching powder
D. NaCl
✅ Correct Answer: B. Washing soda
Q70. The chemical used in cold drinks is:
A. Sodium carbonate
B. Sodium hydrogen carbonate
C. Sodium chloride
D. Calcium carbonate
✅ Correct Answer: B. Sodium hydrogen carbonate (NaHCO₃)
Q71. Which of these salts is hygroscopic in nature?
A. NaHCO₃
B. Na₂CO₃
C. CaCl₂
D. NaCl
✅ Correct Answer: C. CaCl₂
Explanation: Calcium chloride absorbs moisture and is used as a drying agent.
Q72. Which salt is used as an ingredient of baking powder?
A. NaCl
B. Na₂CO₃
C. NaHCO₃
D. CaSO₄
✅ Correct Answer: C. NaHCO₃ (baking soda)
Q73. Baking powder is a mixture of:
A. NaHCO₃ + tartaric acid
B. NaHCO₃ + NaCl
C. Na₂CO₃ + NaHCO₃
D. Na₂CO₃ + HCl
✅ Correct Answer: A. NaHCO₃ + tartaric acid
Explanation: Tartaric acid prevents bitter taste of Na₂CO₃ formed on heating.
Q74. The salt used in making “Idli batter fluffy” is:
A. NaCl
B. Baking soda
C. Washing soda
D. POP
✅ Correct Answer: B. Baking soda
Explanation: Baking soda releases CO₂ → makes batter fluffy.
Q75. Which of the following is NOT a use of Plaster of Paris?
A. To make chalks
B. To make bandages
C. For setting broken bones
D. As an antacid
✅ Correct Answer: D. As an antacid
Explanation: POP is not edible and cannot be used for medicinal purposes.
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