chemistry general knowledge questions and answers-2 FOR ALL COMPETITIVE EXAMS

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for Chemistry General Knowledge Questions and Answers (Part 1)

Chemistry General Knowledge Questions and Answers (Part 2)

Question 31: What is the chemical symbol for lead?

A) Ld
B) Pb
C) Le
D) Pd
Answer: B) Pb
(Lead’s symbol is Pb, derived from the Latin word “Plumbum.”)

Question 32: Which element is used in making computer chips?

A) Silicon
B) Carbon
C) Gold
D) Aluminum
Answer: A) Silicon
(Silicon is a key component in semiconductors and computer chips.)

Question 33: What is the chemical formula for ammonia?

A) NH₃
B) NH₄
C) NO₂
D) N₂O
Answer: A) NH₃
(Ammonia is a compound of nitrogen and hydrogen with the formula NH₃.)

Question 34: Which gas is used in fire extinguishers?

A) Oxygen
B) Carbon Dioxide
C) Nitrogen
D) Helium
Answer: B) Carbon Dioxide
(Carbon dioxide is used in fire extinguishers to smother flames.)

Question 35: What is the chemical symbol for tin?

A) Ti
B) Sn
C) Tn
D) Si
Answer: B) Sn
(Tin’s symbol is Sn, derived from the Latin word “Stannum.”)

Question 36: Which element is the primary component of coal?

A) Oxygen
B) Carbon
C) Hydrogen
D) Sulfur
Answer: B) Carbon
(Coal is primarily composed of carbon, along with other elements like hydrogen and sulfur.)

Question 37: What is the chemical formula for methane?

A) CH₄
B) CO₂
C) C₂H₆
D) H₂O
Answer: A) CH₄
(Methane is the simplest hydrocarbon with the formula CH₄.)

Question 38: Which element is used in fluorescent bulbs?

A) Neon
B) Argon
C) Mercury
D) Krypton
Answer: C) Mercury
(Mercury vapor is used in fluorescent bulbs to produce light.)

Question 39: What is the chemical symbol for copper?

A) Co
B) Cu
C) Cp
D) Cr
Answer: B) Cu
(Copper’s symbol is Cu, derived from the Latin word “Cuprum.”)

Question 40: Which gas is known as “marsh gas”?

A) Methane
B) Ethane
C) Propane
D) Butane
Answer: A) Methane
(Methane is often called marsh gas because it is produced in wetlands.)

Question 41: What is the chemical formula for hydrogen peroxide?

A) H₂O
B) H₂O₂
C) HO
D) H₃O
Answer: B) H₂O₂
(Hydrogen peroxide is a common antiseptic with the formula H₂O₂.)

Question 42: Which element is used in nuclear reactors as a fuel?

A) Uranium
B) Plutonium
C) Thorium
D) All of the above
Answer: D) All of the above
(Uranium, plutonium, and thorium are all used as nuclear fuels.)

Question 43: What is the chemical symbol for sulfur?

A) Su
B) S
C) Sl
D) Sr
Answer: B) S
(Sulfur’s symbol is S, derived from its Latin name “Sulfur.”)

Question 44: Which gas is used in welding?

A) Oxygen
B) Acetylene
C) Nitrogen
D) Helium
Answer: B) Acetylene
(Acetylene is commonly used in welding due to its high flame temperature.)

Question 45: What is the chemical formula for carbon monoxide?

A) CO
B) CO₂
C) C₂O
D) CH₄
Answer: A) CO
(Carbon monoxide is a toxic gas with the formula CO.)

Question 46: Which element is the most abundant in the Earth’s crust?

A) Oxygen
B) Silicon
C) Aluminum
D) Iron
Answer: A) Oxygen
(Oxygen makes up about 46% of the Earth’s crust by weight.)

Question 47: What is the chemical symbol for phosphorus?

A) Ph
B) P
C) Ps
D) Po
Answer: B) P
(Phosphorus’s symbol is P, derived from its Latin name “Phosphorus.”)

Question 48: Which gas is used in refrigerators and air conditioners?

A) Ammonia
B) Freon
C) Carbon Dioxide
D) Nitrogen
Answer: B) Freon
(Freon is a common refrigerant used in cooling systems.)

Question 49: What is the chemical formula for nitric acid?

A) HCl
B) H₂SO₄
C) HNO₃
D) H₃PO₄
Answer: C) HNO₃
(Nitric acid is a strong acid with the formula HNO₃.)

Question 50: Which element is used in making matches?

A) Sulfur
B) Phosphorus
C) Carbon
D) Sodium
Answer: B) Phosphorus
(Phosphorus is a key component in the striking surface of matches.)

This extended quiz provides a comprehensive set of Chemistry General Knowledge Questions and Answers, perfect for students, educators, and trivia enthusiasts.