POST UTME LASU 2025 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A solution of 0.1 M NaCl is prepared by dissolving 6.0 g of NaCl in 100 mL of water. What is the concentration of Na+ ions in the solution?
A. 0.01 M
B. 0.05 M
C. 0.1 M
D. 0.5 M
Question 2
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 3
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 4
A sample of 1.0 g of C6H12O6 is burned in a bomb calorimeter. The heat of combustion is 13.8 kJ/g. What is the total heat of combustion for the sample?
A. 13.8 kJ
B. 27.6 kJ
C. 41.4 kJ
D. 55.2 kJ
Question 5
Determine the pH of a 0.1 M solution of HCl at 25°C.
A. 1
B. 2
C. 3
D. 4
Question 6
A 50 mL sample of a solution containing 0.1 M HCl is titrated with 0.1 M NaOH. Calculate the number of moles of NaOH required to completely neutralize the HCl.
A. 0.005
B. 0.0075
C. 0.01
D. 0.0125
Question 7
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 8
A reaction is said to be at equilibrium when the rates of forward and reverse reactions are equal. What is the name of the law that describes this condition?
A. Le Chatelier's Principle
B. Gibbs Free Energy Equation
C. Equilibrium Cons\tant Expression
D. Rate Law
Question 9
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 10
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.
Question 11
A solution of 0.1 M HCl is titrated with 0.1 M NaOH. What is the pH of the solution after 25 mL of NaOH has been added?
A. 1
B. 2
C. 3
D. 4
Question 12
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 13
A 2.00 M solution of HCl is prepared by dissolving 40.0 g of HCl 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 14
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 15
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.

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