Questions on Chemical Symbols and Formulas
Multiple-Choice Questions – Chemical Symbols and Formulas
1. What does the chemical symbol H represent?
A) Helium
B) Hydrogen
C) Hafnium
D) Holmium
E) Hydrogen peroxide
2. Which of these is the correct chemical formula for water?
A) H₂O₂
B) H₂O
C) HO₂
D) OH
E) H₂
3. What element is represented by the symbol Na?
A) Nitrogen
B) Sodium
C) Neon
D) Nickel
E) Nitric acid
4. The chemical formula CO₂ represents:
A) Carbon monoxide
B) Carbon dioxide
C) Calcium oxide
D) Copper oxide
E) Carbon tetrachloride
5. What does the chemical formula NaCl represent?
A) Sodium chloride
B) Sodium carbonate
C) Nitric acid
D) Sodium hydroxide
E) Nitrogen chloride
6. Which of these is a chemical formula for ammonia?
A) NH₄
B) NH₃
C) N₂H₄
D) NH
E) NO₃
7. What element is represented by the symbol Fe?
A) Fluorine
B) Francium
C) Iron
D) Fermium
E) Flerovium
8. What is the formula for sulfuric acid?
A) H₂SO₄
B) H₂SO₃
C) H₂CO₃
D) H₂SO₂
E) H₂S
9. What does the formula CaCO₃ represent?
A) Calcium chloride
B) Calcium carbonate
C) Calcium hydroxide
D) Calcium sulfate
E) Calcium oxide
10. What does the symbol Mg stand for?
A) Manganese
B) Magnesium
C) Molybdenum
D) Mercury
E) Magnesium oxide
11. Which is the chemical formula for glucose?
A) C₆H₁₂O₆
B) C₆H₆
C) CH₄
D) CO₂
E) C₂H₅OH
12. What does the chemical symbol Cl represent?
A) Chlorine
B) Calcium
C) Carbon
D) Chromium
E) Chlorate
13. The formula HCl stands for:
A) Hydrochloric acid
B) Hydrogen chloride
C) Hypochlorous acid
D) Hydrogen cyanide
E) Hydrogen peroxide
14. What is the chemical formula for methane?
A) CH₄
B) C₂H₆
C) C₆H₁₂O₆
D) CO₂
E) C₂H₄
15. Which formula represents carbon monoxide?
A) CO₂
B) CO
C) C₂O
D) C₂O₂
E) C₃O
16. The chemical formula KNO₃ is for:
A) Potassium nitrate
B) Potassium oxide
C) Potassium hydroxide
D) Potassium chloride
E) Potassium carbonate
17. What element has the symbol Pb?
A) Platinum
B) Palladium
C) Lead
D) Polonium
E) Plutonium
18. What is the chemical formula for baking soda?
A) NaCl
B) NaHCO₃
C) NaOH
D) KCl
E) KOH
19. Which of these is the formula for oxygen gas?
A) O
B) O₂
C) O₃
D) CO₂
E) H₂O
20. The chemical formula H₂SO₃ represents:
A) Sulfuric acid
B) Sulfurous acid
C) Hydrochloric acid
D) Carbonic acid
E) Nitric acid
21. What does the symbol Ag represent?
A) Gold
B) Argon
C) Silver
D) Aluminium
E) Arsenic
22. Which formula is for nitric acid?
A) HNO₃
B) HNO₂
C) NH₃
D) H₂SO₄
E) HCl
23. What element is represented by the symbol Zn?
A) Zirconium
B) Zinc
C) Xenon
D) Sodium
E) Neon
24. What is the formula for carbonic acid?
A) H₂SO₄
B) H₂CO₃
C) HCl
D) HNO₃
E) H₂O₂
25. Which formula represents calcium hydroxide?
A) Ca(OH)₂
B) CaO
C) CaCO₃
D) CaSO₄
E) CaCl₂
26. The symbol Cu stands for:
A) Copper
B) Carbon
C) Calcium
D) Cobalt
E) Chlorine
27. What does the chemical formula C₂H₅OH represent?
A) Methanol
B) Ethanol
C) Acetic acid
D) Formaldehyde
E) Propanol
28. What element is represented by the symbol He?
A) Helium
B) Hydrogen
C) Hafnium
D) Holmium
E) Hassium
29. Which formula is for hydrogen peroxide?
A) H₂O
B) H₂O₂
C) HO
D) H₂SO₄
E) HCl
30. What is the formula for table salt?
A) KCl
B) NaCl
C) NaOH
D) CaCl₂
E) MgCl₂
Answer Key with Explanations
1. B) Hydrogen
2. B) H₂O is water
3. B) Sodium
4. B) Carbon dioxide
5. A) Sodium chloride
6. B) NH₃ is ammonia
7. C) Iron
8. A) H₂SO₄ is sulfuric acid
9. B) Calcium carbonate
10. B) Magnesium
11. A) C₆H₁₂O₆ is glucose
12. A) Chlorine
13. A) Hydrochloric acid
14. A) CH₄ is methane
15. B) CO is carbon monoxide
16. A) Potassium nitrate
17. C) Lead
18. B) NaHCO₃ is baking soda
19. B) O₂ is oxygen gas
20. B) H₂SO₃ is sulfurous acid
21. C) Silver
22. A) HNO₃ is nitric acid
23. B) Zinc
24. B) H₂CO₃ is carbonic acid
25. A) Ca(OH)₂ is calcium hydroxide
26. A) Copper
27. B) C₂H₅OH is ethanol
28. A) Helium
29. B) H₂O₂ is hydrogen peroxide
30. B) NaCl is table salt (sodium chloride)
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