JAMB Chemistry Past Questions and Answers

 

Chemistry questions with options and answers:

 

Question: What is the smallest unit of an element that retains its chemical properties?

 

A. Atom

B. Molecule

C. Cell

D. Proton

Answer: A. Atom

 

Question: What is the pH of a solution with a hydrogen ion concentration of 1 x 10^(-8) M?

 

A. 6

B. 8

C. 10

D. 12

Answer: B. 8

 

Question: Which of the following is a noble gas?

 

A. Oxygen (O)

B. Helium (He)

C. Nitrogen (N)

D. Fluorine (F)

Answer: B. Helium (He)

 

Question: What is the chemical symbol for gold?

 

A. Au

B. Ag

C. Hg

D. Fe

Answer: A. Au

 

Question: What is the process of converting a gas into a liquid called?

 

A. Condensation

B. Evaporation

C. Sublimation

D. Fusion

Answer: A. Condensation

 

Question: How many valence electrons does carbon have?

 

A. 2

B. 4

C. 6

D. 8

Answer: C. 6

 

Question: What type of bond involves the sharing of electrons between atoms?

 

A. Ionic bond

B. Covalent bond

C. Metallic bond

D. Polar bond

Answer: B. Covalent bond

 

Question: What is the chemical formula for methane?

 

A. CH3OH

B. C2H6

C. CH4

D. CO2

Answer: C. CH4

 

Question: Which element has the chemical symbol “Na”?

 

A. Nitrogen

B. Nickel

C. Sodium

D. Neon

Answer: C. Sodium

 

Question: What is the balanced chemical equation for the reaction between hydrogen and oxygen to form water?

 

A. 2H2 + O2 → 2H2O

B. H2 + O2 → H2O

C. 4H2 + 2O2 → 4H2O

D. H2O → H2 + O2

Answer: B. 2H2 + O2 → 2H2O

 

Question: Which of the following is a halogen?

 

A. Chlorine (Cl)

B. Sodium (Na)

C. Calcium (Ca)

D. Potassium (K)

Answer: A. Chlorine (Cl)

 

Question: What is the term for the substance that speeds up a chemical reaction without being consumed in the process?

 

A. Catalyst

B. Reactant

C. Product

D. Inhibitor

Answer: A. Catalyst

 

Question: What is the chemical formula for sulfuric acid?

 

A. HCl

B. H2SO4

C. NaOH

D. CH3COOH

Answer: B. H2SO4

 

Question: Which gas makes up the majority of Earth’s atmosphere?

 

A. Oxygen

B. Nitrogen

C. Carbon dioxide

D. Hydrogen

Answer: B. Nitrogen

 

Question: What is the electron configuration of oxygen?

 

A. 1s² 2s² 2p⁶ 3s² 3p⁴

B. 1s² 2s² 2p⁴

C. 1s² 2s² 2p⁶ 3s²

D. 1s² 2s² 2p⁶ 3s² 3p²

Answer: D. 1s² 2s² 2p⁶ 3s² 3p²

 

Question: What is the chemical symbol for iron?

 

A. Ir

B. Fe

C. Au

D. Ag

Answer: B. Fe

 

Question: Which of the following is a greenhouse gas?

 

A. Oxygen

B. Nitrogen

C. Carbon dioxide

D. Helium

Answer: C. Carbon dioxide

 

Question: What is the name of the process where a substance changes directly from a solid to a gas without passing through the liquid phase?

 

A. Melting

B. Sublimation

C. Evaporation

D. Condensation

Answer: B. Sublimation

 

Question: What is the molecular formula for glucose?

 

A. C6H12O6

B. CH4

C. CO2

D. H2O

Answer: A. C6H12O6

 

Question: What is the chemical formula for ammonia?

 

A. NH3

B. N2H4

C. NO2

D. N2O

Answer: A. NH3

 

Question: What is the common name for the reaction between an acid and a base to produce water and a salt?

 

A. Oxidation

B. Reduction

C. Neutralization

D. Hydrolysis

Answer: C. Neutralization

 

Question: Which of the following is a characteristic of a base?

 

A. Produces H⁺ ions in solution

B. Tastes sour

C. Turns blue litmus paper red

D. Feels slippery

Answer: D. Feels slippery

 

Question: What is the molar mass of water (H2O)?

 

A. 18 g/mol

B. 22 g/mol

C. 16 g/mol

D. 12 g/mol

Answer: A. 18 g/mol

 

Question: Which subatomic particle has a negative charge?

 

A. Proton

B

. Neutron

C. Electron

D. Nucleus

Answer: C. Electron.