POST UTME KSU 2025 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A solution of 0.1 M HCl is prepared by dissolving 0.1 g of HCl in water to make 1 L of solution. What is the concentration of H+ ions in the solution?
A. 0.01 M
B. 0.1 M
C. 1.0 M
D. 10.0 M
Question 2
A mixture of 0.5 g of NaOH and 0.5 g of HCl is dissolved in 100 mL of water. Calculate the pH of the resulting solution.
A. 1
B. 2
C. 3
D. 4
Question 3
The reaction of cyclohexane with bromine in the presence of light produces a mixture of 1,2-dibromocyclohexane and 1,4-dibromocyclohexane. What is the major product of this reaction?
A. 1,2-dibromocyclohexane
B. 1,4-dibromocyclohexane
C. cis-1,2-dibromocyclohexane
D. trans-1,2-dibromocyclohexane
Question 4
A sample of a hydrocarbon has the molecular formula C5H12. What is the name of the hydrocarbon?
A. Pen\tane
B. Hexane
C. Hep\tane
D. Oc\tane
Question 5
The half-life of a radioactive subs\tance is 5 years. If the initial amount of the subs\tance is 100 g, what is the amount of the subs\tance remaining after 10 years?
A. 12.5 g
B. 25 g
C. 50 g
D. 100 g
Question 6
A 1.00 L sample of a solution containing 0.050 M NaOH and 0.050 M HCl is titrated with 0.100 M HCl. What is the pH of the solution after the titration?
A. 7.00
B. 7.50
C. 8.00
D. 9.00
Question 7
A sample of a subs\tance has a mass of 25 g. If the density of the subs\tance is 2.5 g/mL, what is the volume of the subs\tance?
A. 10 mL
B. 20 mL
C. 25 mL
D. 30 mL
Question 8
A 2.0 L flask contains 0.5 mol of CO2 at 25°C. Calculate the partial pressure of CO2 in the flask.
A. 0.5 atm
B. 1.0 atm
C. 1.5 atm
D. 2.0 atm
Question 9
The rate cons\tant for a first-order reaction is 0.05 min^-1. If the initial concentration of the reac\tant is 0.1 M, what is the concentration of the reac\tant after 10 minutes?
A. 0.01 M
B. 0.05 M
C. 0.1 M
D. 0.2 M
Question 10
The following diagram shows the structure of a molecule. What is the type of bond between atoms A and B?
A. Covalent bond
B. Ionic bond
C. Hydrogen bond
D. Van der Waals force
Question 11
A sample of a subs\tance has a mass of 25 g. If the density of the subs\tance is 2.5 g/mL, what is the volume of the subs\tance?
A. 10 mL
B. 20 mL
C. 25 mL
D. 30 mL
Question 12
A 1.0 L flask contains 0.2 mol of O2 at 25°C. Calculate the mole \fraction of O2 in the flask.
A. 0.2
B. 0.4
C. 0.6
D. 0.8
Question 13
The atomic number of an element is 12. What is the electronic configuration of the element?
A. 1s^2 2s^2 2p^6 3s^2 3p^6
B. 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2
C. 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 4p^6
D. 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 4p^6 5s^2
Question 14
A 2.0 L flask contains 0.5 mol of H2 at 25°C. Calculate the number of moles of O2 required to react with H2 completely.
A. 0.25
B. 0.5
C. 0.75
D. 1.0
Question 15
A 2.00 L sample of a solution containing 0.050 M NaOH and 0.050 M HCl is titrated with 0.100 M HCl. What is the pH of the solution after the titration?
A. 7.00
B. 7.50
C. 8.00
D. 9.00

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