chemistry general knowledge questions and answers-4 FOR ALL COMPETITIVE EXAMS

chemistry general knowledge questions and answers-4

chemistry general knowledge questions and answers-4,Hello dear students , Chemistry General Knowledge Questions and Answers. Each question is followed by multiple-choice options and the correct answer.

Absolutely! Here are 20 more Chemistry General Knowledge Questions and Answers to expand your quiz. These questions are designed to be engaging, educational, and optimized for the keyword “chemistry general knowledge questions and answers.”

Here 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 at the end of each question. These are suitable for competitive exams.

1. What is the chemical symbol for sodium?

a) So
b) Na
c) Sd
d) No
Answer: b) Na
Explanation: The chemical symbol for sodium is Na, derived from its Latin name “Natrium.”

2. Which gas is known as the “silent killer”?

a) Carbon monoxide
b) Nitrogen
c) Oxygen
d) Hydrogen
Answer: a) Carbon monoxide
Explanation: Carbon monoxide (CO) is called the “silent killer” because it is colorless, odorless, and toxic.

3. What is the chemical formula of common table sugar (sucrose)?

a) C₆H₁₂O₆
b) C₁₂H₂₂O₁₁
c) C₂H₅OH
d) CH₄
Answer: b) C₁₂H₂₂O₁₁
Explanation: Sucrose, or table sugar, has the chemical formula C₁₂H₂₂O₁₁.

4. Which element is used in making computer chips?

a) Silicon
b) Carbon
c) Aluminum
d) Copper
Answer: a) Silicon
Explanation: Silicon is a semiconductor and is widely used in making computer chips and electronic devices.

5. What is the chemical formula of hydrochloric acid?

a) HCl
b) H₂SO₄
c) HNO₃
d) H₃PO₄
Answer: a) HCl
Explanation: Hydrochloric acid is a strong acid with the chemical formula HCl.

6. Which gas is used in the manufacture of ammonia?

a) Oxygen
b) Nitrogen
c) Hydrogen
d) Carbon dioxide
Answer: b) Nitrogen
Explanation: Nitrogen (N₂) is used in the Haber process to manufacture ammonia (NH₃).

7. What is the chemical symbol for iron?

a) Ir
b) Fe
c) In
d) Fr
Answer: b) Fe
Explanation: The chemical symbol for iron is Fe, derived from its Latin name “Ferrum.”

8. 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 in food packaging to prevent oxidation and spoilage.

9. What is the chemical formula of ethanol?

a) C₂H₅OH
b) CH₃OH
c) C₆H₁₂O₆
d) C₁₂H₂₂O₁₁
Answer: a) C₂H₅OH
Explanation: Ethanol, commonly known as alcohol, has the chemical formula C₂H₅OH.

10. Which element is the primary component of coal?

a) Carbon
b) Hydrogen
c) Oxygen
d) Nitrogen
Answer: a) Carbon
Explanation: Coal is primarily composed of carbon, along with small amounts of other elements.

11. What is the chemical formula of carbon dioxide?

a) CO
b) CO₂
c) C₂O
d) C₂O₃
Answer: b) CO₂
Explanation: Carbon dioxide is a gas with the chemical formula CO₂.

12. 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.

13. What is the chemical symbol for lead?

a) Ld
b) Pb
c) Le
d) Pl
Answer: b) Pb
Explanation: The chemical symbol for lead is Pb, derived from its Latin name “Plumbum.”

14. Which acid is present in car batteries?

a) Hydrochloric acid
b) Sulfuric acid
c) Nitric acid
d) Acetic acid
Answer: b) Sulfuric acid
Explanation: Car batteries contain sulfuric acid (H₂SO₄) as the electrolyte.

15. What is the chemical formula of calcium carbonate?

a) CaCO₃
b) CaCl₂
c) CaO
d) Ca(OH)₂
Answer: a) CaCO₃
Explanation: Calcium carbonate, found in limestone and chalk, has the chemical formula CaCO₃.

16. Which gas is used in refrigerators?

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

17. What is the chemical symbol for copper?

a) Co
b) Cu
c) Cp
d) Cr
Answer: b) Cu
Explanation: The chemical symbol for copper is Cu, derived from its Latin name “Cuprum.”

18. 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 the filament from oxidizing.

19. 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 chemical formula CH₄.

20. Which element is used in making pencils?

a) Carbon
b) Silicon
c) Lead
d) Graphite
Answer: d) Graphite
Explanation: Pencils are made of graphite, a form of carbon, not lead.

21. 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 chemical formula H₂S.

22. 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 commonly used as an anesthetic in medical procedures.

23. What is the chemical symbol for potassium?

a) P
b) K
c) Po
d) Pt
Answer: b) K
Explanation: The chemical symbol for potassium is K, derived from its Latin name “Kalium.”

24. Which acid is found in ant stings?

a) Formic acid
b) Acetic acid
c) Citric acid
d) Hydrochloric acid
Answer: a) Formic acid
Explanation: Ant stings contain formic acid, which causes irritation and pain.

25. What is the chemical formula of sodium hydroxide?

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

26. Which gas is used in balloons for weather forecasting?

a) Helium
b) Hydrogen
c) Nitrogen
d) Oxygen
Answer: b) Hydrogen
Explanation: Hydrogen is used in weather balloons because it is lighter than air.

27. What is the chemical formula of sulfur dioxide?

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

28. Which element is used in making mirrors?

a) Silver
b) Aluminum
c) Gold
d) Copper
Answer: a) Silver
Explanation: Silver is used in making mirrors due to its high reflectivity.

29. What is the chemical formula of potassium nitrate?

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

30. Which gas is used in the production of fertilizers?

a) Oxygen
b) Nitrogen
c) Hydrogen
d) Carbon dioxide
Answer: b) Nitrogen
Explanation: Nitrogen is a key component in the production of fertilizers, such as ammonia and urea.

These additional 30 questions cover a wide range of chemistry topics and are designed to help you prepare for competitive exams. Good luck!

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