Chemistry WAEC past questions and answers

Chemistry WAEC past questions and answers

Which of the following elements is a noble gas?

A) Oxygen

B) Neon

C) Sodium

D) Chlorine

Answer: B) Neon

What is the chemical symbol for gold?

A) Au

B) Ag

C) Fe

D) Cu

Answer: A) Au

Which of the following is a strong acid?

A) HCl

B) CH3OH

C) H2O

D) NH3

Answer: A) HCl

What is the pH of a neutral solution?

A) 0

B) 7

C) 14

D) 1

Answer: B) 7

Which gas is responsible for the greenhouse effect on Earth?

A) Oxygen

B) Carbon dioxide

C) Nitrogen

D) Hydrogen

Answer: B) Carbon dioxide

What is the chemical formula for water?

A) H2O2

B) CO2

C) H2O

D) CH4

Answer: C) H2O

In a chemical reaction, what does the arrow symbol (->) represent?

A) Addition

B) Subtraction

C) Equals

D) Yields

Answer: D) Yields

Which of the following is a halogen?

A) Sodium

B) Fluorine

C) Calcium

D) Iron

Answer: B) Fluorine

What is the atomic number of carbon?

A) 6

B) 12

C) 14

D) 22

Answer: A) 6

What is the unit of measurement for energy in chemistry?

A) Joule

B) Watt

C) Newton

D) Pascal

Answer: A) Joule

Which subatomic particle carries a negative charge?

A) Proton

B) Neutron

C) Electron

D) Positron

Answer: C) Electron

What is the chemical formula for methane?

A) CH4

B) CO2

C) H2O

D) C2H6

Answer: A) CH4

Which type of bond involves the sharing of electrons?

A) Ionic

B) Covalent

C) Metallic

D) Polar

Answer: B) Covalent

What is the process of converting a gas to a liquid called?

A) Evaporation

B) Sublimation

C) Condensation

D) Deposition

Answer: C) Condensation

Which element is essential for organic compounds?

A) Carbon

B) Oxygen

C) Nitrogen

D) Hydrogen

Answer: A) Carbon

What is the chemical symbol for iron?

A) Fe

B) Au

C) Ag

D) Pb

Answer: A) Fe

What is the SI unit for measuring the amount of a substance?

A) Mole

B) Gram

C) Liter

D) Newton

Answer: A) Mole

Which of the following is a greenhouse gas?

A) Oxygen

B) Nitrogen

C) Methane

D) Argon

Answer: C) Methane

What is the main component of natural gas?

A) Methane

B) Ethane

C) Propane

D) Butane

Answer: A) Methane

Which law states that the total pressure of a gas mixture is the sum of the partial pressures of its individual gases?

A) Boyle's Law

B) Charles's Law

C) Dalton's Law

D) Avogadro's Law

Answer: C) Dalton's Law