Jamb Chemistry 2023 Past Questions and Answers

Question 41:

• JAMB 2023

What is eutrophication?

A. The release of harmful chemicals into water bodies
B. The excessive growth of algae due to nutrient enrichment
C. The presence of heavy metals in water
D. The formation of oil slicks on water surfaces

Question 42:

• JAMB 2023

What is the name of the process by which ammonia is produced on an industrial scale?

A. Nitrogenation
B. Ammoniation
C. Nitrification
D. Haber process

Question 43:

• JAMB 2023

Who proposed the planetary model of the atom with electrons orbiting the nucleus?

A. Erwin Schrödinger
B. Ernest Rutherford
C. Niels Bohr
D. J.J. Thomson

Question 44:

• JAMB 2023

Which of the following is an example of an endothermic reaction?

A. Combustion of propane (C\(_3\)H\(_8\)) to produce carbon dioxide (CO\(_2\)) and water (H\(_2\)O).
B. Burning of methane (CH\(_4\)) in the presence of oxygen
C. Formation of table salt (NaCl) from sodium (Na) and chlorine (Cl\(_2\)).
D. Decomposition of hydrogen peroxide (H\(_2\)O\(_2\)) into water (H\(_2\)O) and oxygen (O\(_2\)).

Question 45:

• JAMB 2023

What happens to the value of the equilibrium constant (Kc) for a reaction if the reaction is reversed?

A. It becomes zero
B. It becomes negative
C. It remains the same
D. It becomes the reciprocal of the original value