Jamb Chemistry 2023 Past Questions and Answers

Question 1:

• JAMB 2023

Sodium reacts vigorously with water to produce

A. Sodium chloride (NaCl) and oxygen gas (O2)
B. Sodium nitrate (NaNO3) and water (H2O)
C. Sodium hydroxide (NaOH) and hydrogen gas (H2)
D. Sodium oxide (Na2O) and hydrogen gas (H2)

Question 2:

• JAMB 2023

At room temperature and standard pressure, chlorine gas is in which state of matter?

A. Plasma
B. Solid
C. Liquid
D. Gas

Question 3:

• JAMB 2023

What is the molecular geometry of a molecule with three bonding pairs and no lone pairs around the central atom?

A. Tetrahedral
B. Trigonal planar
C. Linear
D. Octahedral

Question 4:

• JAMB 2023

Isotopes of an element have

A. The same number of protons but different numbers of neutrons.
B. The same number of neutrons and electrons
C. The same number of protons and neutrons
D. The same number of protons and electrons

Question 5:

• JAMB 2023

Which element is placed at the top of the electrochemical series?

A. Copper
B. Hydrogen
C. Sodium
D. Oxygen