POST UTME CALEB UNIVERSITY 2023 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
The reaction of cyclohexane with bromine in the presence of light yields a mixture of 1,2-dibromocyclohexane and 1,4-dibromocyclohexane. The major product is 1,4-dibromocyclohexane. What is the correct explanation for this observation?
A. The reaction is an example of a radical substitution reaction, where the bromine radical is more stable when it is located at the 1,4-position.
B. The reaction is an example of an electrophilic addition reaction, where the bromine molecule is more reactive when it is located at the 1,4-position.
C. The reaction is an example of a nucleophilic substitution reaction, where the bromine molecule is more reactive when it is located at the 1,4-position.
D. The reaction is an example of a cycloaddition reaction, where the bromine molecule is more reactive when it is located at the 1,4-position.
Question 2
A 1.0 L flask contains 0.2 M HCl. If 1.0 M NaOH is added to the flask, what is the concentration of the resulting solution?
A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M
Question 3
The following reaction is an example of a nucleophilic substitution reaction.
A. CH3CH2Cl + OH- → CH3CH2OH + Cl-
B. CH3CH2Cl + H2O → CH3CH2OH + HCl
C. CH3CH2Cl + NaOH → CH3CH2ONa + HCl
D. CH3CH2Cl + H2O → CH3CH2Cl + H2O
Question 4
The following diagram shows a titration setup for the determination of the concentration of a strong acid.
A. The burette contains the strong acid.
B. The beaker contains the strong acid.
C. The pipette contains the strong acid.
D. The burette contains the strong base.
Question 5
Determine the number of moles of $\text{O}_2$ required to completely oxidize 1.5 moles of $\text{C}_2\text{H}_6$ in a combustion reaction.
A. 0.75
B. 1.5
C. 2.25
D. 3.0
Question 6
A 2.0 L flask contains 0.5 M HCl. If 1.0 M NaOH is added to the flask, what is the concentration of the resulting solution?
A. 0.5 M
B. 1.0 M
C. 1.5 M
D. 2.0 M
Question 7
The following reaction is an example of a substitution reaction.
A. CH3CH2Cl + NaOH → CH3CH2OH + NaCl
B. CH3CH2Cl + H2O → CH3CH2OH + HCl
C. CH3CH2Cl + NaOH → CH3CH2ONa + HCl
D. CH3CH2Cl + H2O → CH3CH2Cl + H2O
Question 8
The atomic radius of an element is 100 pm. If the element is in the 4th period and has an atomic number of 19, what is the expected value of its electronegativity?
A. 0.8
B. 1.2
C. 1.8
D. 2.2
Question 9
The $pH$ of a 0.100 M solution of $\text{HCl}$ is 1.00. What is the concentration of $\text{HCl}$ in a solution with a $pH$ of 2.00?
A. 0.100
B. 0.500
C. 1.00
D. 5.00
Question 10
Determine the pH of a 0.1 M solution of HCl, given that the dissociation cons\tant of HCl is 10^\( -7 \) and the concentration of HCl is 0.1 M.
A. 1
B. 2
C. 3
D. 4
Question 11
A solution of NaCl is prepared by dissolving 10 g of NaCl in 100 mL of water. What is the molarity of the solution?
A. 0.1 M
B. 0.5 M
C. 1 M
D. 5 M
Question 12
A sample of a gas at 25°C and 1 atm occupies a volume of 2.5 L. What is the pressure of the gas at 50°C and 2 atm?
A. 2 atm
B. 4 atm
C. 6 atm
D. 8 atm
Question 13
The s\tandard enthalpy of formation for CO2(g) is -393.5 kJ/mol. If 2.5 mol of CO2(g) is produced at 25°C, what is the expected value of the reaction enthalpy?
A. -987.5 kJ
B. -987.0 kJ
C. -986.5 kJ
D. -986.0 kJ
Question 14
The following diagram shows a setup for the determination of the concentration of a strong base.
A. The burette contains the strong base.
B. The beaker contains the strong base.
C. The pipette contains the strong base.
D. The burette contains the strong acid.
Question 15
A diagram of a redox reaction is shown below. Identify the oxidizing agent.
A. A
B. B
C. C
D. D

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