chemistry general knowledge questions and answers-5 FOR ALL COMPETITIVE EXAMS

chemistry general knowledge questions and answers-5

Unfortunately, I cannot directly create or provide images, but I can guide you on how to create or find images for each question. Below are 30 more multiple-choice chemistry general knowledge questions (numbered 1 to 30) with four options each, along with the correct answer and a clear explanation. You can pair each question with an appropriate image (e.g., molecular structures, periodic table elements, or chemical reactions) to make it visually engaging.

1. What is the chemical symbol for oxygen?

a) O
b) Ox
c) Oy
d) Om
Answer: a) O
Explanation: The chemical symbol for oxygen is O.

2. Which gas is known as the “tear gas”?

a) Chlorine
b) Ammonia
c) Chloropicrin
d) Carbon dioxide
Answer: c) Chloropicrin
Explanation: Chloropicrin is commonly used as tear gas.

3. What is the chemical formula of hydrogen peroxide?

a) H₂O
b) H₂O₂
c) HO
d) H₃O
Answer: b) H₂O₂
Explanation: Hydrogen peroxide has the chemical formula H₂O₂.

4. Which element is the most abundant in the universe?

a) Oxygen
b) Hydrogen
c) Helium
d) Carbon
Answer: b) Hydrogen
Explanation: Hydrogen is the most abundant element in the universe.

5. What is the chemical formula of methane?

a) CH₄
b) C₂H₆
c) C₃H₈
d) C₄H₁₀
Answer: a) CH₄
Explanation: Methane is the simplest hydrocarbon with the formula CH₄.

6. Which gas is used in the production of soda water?

a) Oxygen
b) Carbon dioxide
c) Nitrogen
d) Hydrogen
Answer: b) Carbon dioxide
Explanation: Carbon dioxide is dissolved in water to make soda water.

7. What is the chemical symbol for silver?

a) Si
b) Ag
c) Au
d) Sr
Answer: b) Ag
Explanation: The chemical symbol for silver is Ag, from its Latin name “Argentum.”

8. Which acid is found in vinegar?

a) Hydrochloric acid
b) Sulfuric acid
c) Acetic acid
d) Nitric acid
Answer: c) Acetic acid
Explanation: Vinegar contains acetic acid (CH₃COOH).

9. What is the chemical formula of common salt?

a) NaCl
b) KCl
c) Na₂O
d) CaCl₂
Answer: a) NaCl
Explanation: Common salt is sodium chloride (NaCl).

Structure of Nacl

10. Which gas is used in neon signs?

a) Neon
b) Argon
c) Helium
d) Krypton
Answer: a) Neon
Explanation: Neon gas is used in neon signs due to its bright red-orange glow.

chemistry general knowledge questions and answers-5 FOR ALL COMPETITIVE EXAMS

11. What is the chemical formula of ammonia?

a) NH₃
b) NO₂
c) N₂O
d) HNO₃
Answer: a) NH₃
Explanation: Ammonia has the chemical formula NH₃.

12. Which element is used in making matchsticks?

a) Phosphorus
b) Sulfur
c) Carbon
d) Potassium
Answer: a) Phosphorus
Explanation: Phosphorus is used in matchsticks for ignition.

chemistry general knowledge questions and answers-5 FOR ALL COMPETITIVE EXAMS

13. What is the chemical formula of ozone?

a) O₂
b) O₃
c) CO₂
d) H₂O
Answer: b) O₃
Explanation: Ozone is a molecule with three oxygen atoms (O₃).

14. Which gas is used in fire extinguishers?

a) Oxygen
b) Carbon dioxide
c) Nitrogen
d) Hydrogen
Answer: b) Carbon dioxide
Explanation: CO₂ is used in fire extinguishers to smother fires.

15. What is the chemical formula of baking soda?

a) NaHCO₃
b) NaOH
c) NaCl
d) Na₂CO₃
Answer: a) NaHCO₃
Explanation: Baking soda is sodium bicarbonate (NaHCO₃).

16. Which element is the primary component of steel?

a) Iron
b) Carbon
c) Nickel
d) Chromium
Answer: a) Iron
Explanation: Steel is primarily made of iron with small amounts of carbon.

17. What is the chemical formula of sulfur dioxide?

a) SO₂
b) SO₃
c) H₂SO₄
d) H₂S
Answer: a) SO₂
Explanation: Sulfur dioxide has the chemical formula SO₂.

18. Which gas is used in the Haber process?

a) Nitrogen
b) Oxygen
c) Hydrogen
d) Carbon dioxide
Answer: a) Nitrogen
Explanation: The Haber process uses nitrogen to produce ammonia.

19. What is the chemical formula of glucose?

a) C₆H₁₂O₆
b) C₁₂H₂₂O₁₁
c) C₂H₅OH
d) CH₄
Answer: a) C₆H₁₂O₆
Explanation: Glucose is a simple sugar with the formula C₆H₁₂O₆.
Image Idea: Molecular structure of glucose.

20. Which gas is used in the preservation of food?

a) Oxygen
b) Nitrogen
c) Carbon dioxide
d) Hydrogen
Answer: b) Nitrogen
Explanation: Nitrogen is used to prevent oxidation in food packaging.

21. What is the chemical formula of ethanol?

a) C₂H₅OH
b) CH₃OH
c) C₆H₁₂O₆
d) C₁₂H₂₂O₁₁
Answer: a) C₂H₅OH
Explanation: Ethanol, or alcohol, has the formula C₂H₅OH.

22. Which gas is used in light bulbs?

a) Oxygen
b) Nitrogen
c) Argon
d) Hydrogen
Answer: c) Argon
Explanation: Argon is used in light bulbs to prevent filament oxidation.

23. What is the chemical formula of calcium carbonate?

a) CaCO₃
b) CaCl₂
c) CaO
d) Ca(OH)₂
Answer: a) CaCO₃
Explanation: Calcium carbonate is found in limestone and chalk.

24. Which gas is used in welding?

a) Oxygen
b) Nitrogen
c) Acetylene
d) Hydrogen
Answer: c) Acetylene
Explanation: Acetylene (C₂H₂) is used in welding due to its high flame temperature.

25. What is the chemical formula of potassium nitrate?

a) KNO₃
b) K₂O
c) KOH
d) KCl
Answer: a) KNO₃
Explanation: Potassium nitrate, or saltpeter, has the formula KNO₃.

26. Which gas is used in anesthesia?

a) Nitrous oxide
b) Oxygen
c) Nitrogen
d) Carbon dioxide
Answer: a) Nitrous oxide
Explanation: Nitrous oxide (N₂O) is used as an anesthetic.

27. What is the chemical formula of hydrogen sulfide?

a) H₂S
b) H₂SO₄
c) H₂O
d) H₂O₂
Answer: a) H₂S
Explanation: Hydrogen sulfide is a toxic gas with the formula H₂S.

28. Which gas is used in refrigerators?

a) Ammonia
b) Oxygen
c) Nitrogen
d) Carbon dioxide
Answer: a) Ammonia
Explanation: Ammonia (NH₃) is used as a refrigerant.

29. What is the chemical formula of sodium hydroxide?

a) NaOH
b) Na₂O
c) NaCl
d) NaHCO₃
Answer: a) NaOH
Explanation: Sodium hydroxide, or caustic soda, has the formula NaOH.

30. Which gas is used in weather balloons?

a) Helium
b) Hydrogen
c) Nitrogen
d) Oxygen
Answer: b) Hydrogen
Explanation: Hydrogen is used in weather balloons due to its low density.

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