POST UTME LASU 2025 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
In a redox reaction, what is the role of the oxidizing agent?
A. To donate electrons
B. To accept electrons
C. To facilitate the reaction
D. To inhibit the reaction
Question 2
A 0.1 M solution of NaOH is mixed with a 0.1 M solution of HCl. What is the pH of the resulting solution?
A. 1
B. 2
C. 3
D. 4
Question 3
What is the difference between a primary and secondary bond in atomic structure?
A. Primary bonds are stronger than secondary bonds
B. Primary bonds are weaker than secondary bonds
C. Primary bonds are ionic, while secondary bonds are covalent
D. Primary bonds are covalent, while secondary bonds are ionic
Question 4
A sample of a metal oxide, M2O3, has a mass of 25.0 g and a volume of 2.50 cm3. If the density of the oxide is 4.50 g/cm3, calculate the molar mass of the oxide.
A. 150 g/mol
B. 200 g/mol
C. 250 g/mol
D. 300 g/mol
Question 5
A 2.00 M solution of NaOH is prepared by dissolving 40.0 g of NaOH in 1000.0 cm3 of water. Calculate the concentration of the solution in mol/dm3.
A. 0.20 mol/dm3
B. 0.40 mol/dm3
C. 0.80 mol/dm3
D. 1.60 mol/dm3
Question 6
A 25 mL sample of a solution containing 0.1 M HCl is titrated with 0.1 M NaOH. Calculate the number of moles of HCl present in the sample after titration.
A. 0.0025
B. 0.005
C. 0.0075
D. 0.01
Question 7
A solution of HCl is prepared by dissolving 25.0 g of HCl in 100.0 cm3 of water. Calculate the concentration of the solution in mol/dm3.
A. 0.25 mol/dm3
B. 0.50 mol/dm3
C. 1.00 mol/dm3
D. 2.00 mol/dm3
Question 8
A diagram of a titration setup is shown below.
A. The burette contains the acid.
B. The beaker contains the base.
C. The burette contains the base.
D. The beaker contains the acid.
Question 9
A 25 mL sample of a solution containing 0.1 M HCl is titrated with 0.1 M NaOH. Calculate the number of moles of HCl present in the sample before titration.
A. 0.0025
B. 0.005
C. 0.0075
D. 0.01
Question 10
A diagram of a simple black and white chemistry apparatus showing a titration setup is shown below. If 25 mL of 0.1 M NaOH is added to 25 mL of 0.1 M HCl, what is the pH of the resulting solution?
A. 1
B. 2
C. 3
D. 4
Question 11
A solution of 0.1 M HCl is prepared by dissolving 6.0 g of HCl in 100 mL of water. What is the pH of the solution?
A. 1
B. 2
C. 3
D. 4
Question 12
Determine the pH of a 0.1 M solution of HCl if 25 mL of 0.1 M NaOH is added to 50 mL of the HCl solution.
A. 1
B. 2
C. 3
D. 4
Question 13
A 2.0 L flask contains 1.0 atm of O2 at 25°C. What is the partial pressure of O2 in the flask?
A. 0.5 atm
B. 1.0 atm
C. 1.5 atm
D. 2.0 atm
Question 14
A 0.1 M solution of HCl is mixed with a 0.1 M solution of NaOH. What is the pH of the resulting solution?
A. 1
B. 2
C. 3
D. 4
Question 15
A diagram of a chemical apparatus is shown below.
A. The test tube contains the acid.
B. The burette contains the base.
C. The test tube contains the base.
D. The burette contains the acid.

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