1. What common household item is a weak acid used for cooking and cleaning?
a) Baking soda
b) Vinegar
c) Salt
d) Sugar
Answer: b) Vinegar
2. Which substance is commonly used as a preservative in processed foods?
a) Sodium chloride
b) Sodium benzoate
c) Calcium carbonate
d) Magnesium sulfate
Answer: b) Sodium benzoate
3. What is the primary chemical component of table salt?
a) Sodium chloride
b) Potassium nitrate
c) Calcium sulfate
d) Magnesium chloride
Answer: a) Sodium chloride
4. Which gas is commonly used in carbonated drinks to make them fizzy?
a) Oxygen
b) Nitrogen
c) Carbon dioxide
d) Hydrogen
Answer: c) Carbon dioxide
5. Which household chemical is often used as a disinfectant and is also a common bleaching agent?
a) Ammonia
b) Hydrogen peroxide
c) Sodium bicarbonate
d) Ethanol
Answer: b) Hydrogen peroxide
6. Which compound is primarily responsible for the “hardness” of water?
a) Sodium chloride
b) Calcium carbonate
c) Potassium chloride
d) Magnesium sulfate
Answer: b) Calcium carbonate
7. Which of the following is an example of a natural polymer commonly found in food?
a) Starch
b) Nylon
c) Polyethylene
d) PVC
Answer: a) Starch
8. What is the chemical formula for baking soda, commonly used in cooking?
a) NaCl
b) CaCO₃
c) NaHCO₃
d) K₂SO₄
Answer: c) NaHCO₃
9. Which of the following is a natural sweetener derived from plants?
a) Aspartame
b) Saccharin
c) Sucralose
d) Stevia
Answer: d) Stevia
10. What substance is used in toothpaste to help prevent cavities?
a) Sodium chloride
b) Fluoride
c) Baking soda
d) Glycerin
Answer: b) Fluoride
11. Which compound is commonly used in antacids to neutralize stomach acid?
a) Sodium hydroxide
b) Magnesium hydroxide
c) Sulfuric acid
d) Calcium chloride
Answer: b) Magnesium hydroxide
12. Which of the following is a common organic solvent used in nail polish remover?
a) Water
b) Acetone
c) Ethanol
d) Glycerin
Answer: b) Acetone
13. What is the active ingredient in most household bleach?
a) Hydrogen peroxide
b) Chlorine
c) Sodium hypochlorite
d) Ammonia
Answer: c) Sodium hypochlorite
14. Which gas is commonly used to fill balloons and is lighter than air?
a) Oxygen
b) Nitrogen
c) Helium
d) Carbon dioxide
Answer: c) Helium
15. Which type of chemical bond holds the atoms together in a water molecule?
a) Ionic bond
b) Covalent bond
c) Metallic bond
d) Hydrogen bond
Answer: b) Covalent bond
16. What is the main chemical component of vinegar?
a) Citric acid
b) Hydrochloric acid
c) Acetic acid
d) Lactic acid
Answer: c) Acetic acid
17. Which element is essential for the production of hemoglobin in the human body?
a) Iron
b) Calcium
c) Potassium
d) Sodium
Answer: a) Iron
18. What is the primary use of calcium carbonate in daily life?
a) As a food preservative
b) In antacids
c) As a fertilizer
d) In cleaning agents
Answer: b) In antacids
19. Which chemical is commonly used as a leavening agent in baking?
a) Baking soda
b) Vinegar
c) Yeast
d) Salt
Answer: a) Baking soda
20. Which of the following substances is commonly used to remove grease and oil stains?
a) Vinegar
b) Baking soda
c) Ammonia
d) Acetone
Answer: c) Ammonia