COMPOUND RELATED MCQ WITH ANSWERS
1. Which compound is known as "sea salt"?
A) Sodium chloride
B) Calcium carbonate
C) Potassium nitrate
D) Magnesium sulfate
**Answer: A) Sodium chloride
2. What is the chemical formula for table sugar?
A) NaCl
B) C6H12O6
C) H2O
D) CO2
**Answer: B) C6H12O6
3. Which gas is commonly used in soft drinks for carbonation?
A) Nitrogen
B) Oxygen
C) Carbon dioxide
D) Helium
**Answer: C) Carbon dioxide
4. What is the chemical formula for water?
A) H2O2
B) CO2
C) H2O
D) NaCl
**Answer: C) H2O
5. Which compound gives vinegar its sour taste?
A) Ethanol
B) Acetic acid
C) Citric acid
D) Lactic acid
**Answer: B) Acetic acid
6. Which gas is responsible for the smell of rotten eggs?
A) Carbon dioxide
B) Hydrogen sulfide
C) Ammonia
D) Methane
**Answer: B) Hydrogen sulfide
8. Which compound is responsible for the green color of plants?
A) Chlorophyll
B) Carotene
C) Hemoglobin
D) Melanin
**Answer: A) Chlorophyll
9. Which compound is used in the production of PVC (polyvinyl chloride)?
A) Ethanol
B) Ethylene
C) Vinyl chloride
D) Acetone
**Answer: C) Vinyl chloride
11. What is the chemical formula for methane?
A) CH4
B) H2O
C) CO2
D) NaCl
**Answer: A) CH4
12. Which compound is found in antifreeze to lower the freezing point of water?
A) Sodium chloride
B) Ethylene glycol
C) Potassium nitrate
D) Sulfuric acid
**Answer: B) Ethylene glycol
13. What is the main component of the Earth's atmosphere?
A) Oxygen
B) Nitrogen
C) Carbon dioxide
D) Hydrogen
**Answer: B) Nitrogen
14. Which compound is known as "dry ice"?
A) Carbon monoxide
B) Carbon dioxide
C) Calcium carbonate
D) Sodium bicarbonate
**Answer: B) Carbon dioxide
15. Which compound is commonly used in batteries?
A) Sulfuric acid
B) Sodium chloride
C) Calcium hydroxide
D) Ethanol
**Answer: A) Sulfuric acid
16. What is the chemical formula for hydrogen peroxide?
A) H2O
B) H2O2
C) HO2
D) H2O3
**Answer: B) H2O2
17. Which compound is commonly used in fertilizers?
A) Ammonium nitrate
B) Sodium chloride
C) Calcium carbonate
D) Potassium hydroxide
**Answer: A) Ammonium nitrate
18. Which compound is known as "laughing gas"?
A) Carbon dioxide
B) Nitrous oxide
C) Oxygen
D) Nitrogen
**Answer: B) Nitrous oxide
19. What is the chemical formula for baking soda?
A) NaCl
B) Na2CO3
C) NaHCO3
D) KCl
**Answer: C) NaHCO3
20. Which compound is responsible for the acidity of citrus fruits?
A) Citric acid
B) Lactic acid
C) Acetic acid
D) Tartaric acid
**Answer: A) Citric acid
21. Which compound is used as a disinfectant and bleaching agent?
A) Hydrogen peroxide
B) Ethanol
C) Ammonia
D) Sodium chloride
**Answer: A) Hydrogen peroxide
22. What is the chemical formula for aspirin?
A) C6H12O6
B) NaCl
C) C9H8O4
D) H2O
**Answer: C) C9H8O4
23. Which compound is commonly used in sunscreen lotions?
A) Zinc oxide
B) Sodium chloride
C) Sulfuric acid
D) Potassium hydroxide
**Answer: A) Zinc oxide
24. What is the chemical formula for ethanol (drinking alcohol)?
A) C6H12O6
B) C2H6O
C) CH4
D) H2O
**Answer: B) C2H6O
25. Which compound is used in making soap?
A) Sodium chloride
B) Sodium bicarbonate
C) Sodium hydroxide
D) Sodium nitrate
**Answer: C) Sodium hydroxide
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