Jamb Chemistry 2023 Past Questions and Answers

Question 71:

• JAMB 2023

Which separation technique is used to separate different pigments in a mixture based on their affinity for a stationary phase and a mobile phase?

A. Chromatography
B. Filtration
C. Decantation
D. Distillation

Question 72:

• JAMB 2023

What is the common name for ethanoic acid?

A. Acetic acid
B. Butyric acid
C. Propionic acid
D. Formic acid

Question 73:

• JAMB 2023

What type of reaction is involved in the formation of alkanols from alkenes?

A. Elimination reaction
B. Redox reaction
C. Substitution reaction
D. Addition reaction

Question 74:

• JAMB 2023

What is the mass percentage of carbon (C) in methane (CH4)? (The molar mass of carbon is approximately 12 g/mol.)

A. 25%
B. 12%
C. 75%
D. 50%

Question 75:

• JAMB 2023

Which of the following is a common property of non-metals?

A. Exist as solids at room temperature
B. Tend to gain electrons in chemical reactions
C. High thermal conductivity
D. Readily form cations in chemical reactions