POST UTME UNIPORT 2025 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
The reaction between sodium hydroxide and hydrochloric acid is a classic example of a neutralization reaction. Which of the following best describes the products of the reaction?
A. NaCl and H2O
B. NaOH and HCl
C. NaCl and NaOH
D. H2O and NaCl
Question 2
A gas has a volume of 2 L at a pressure of 1 atm. What is the volume of the gas at a pressure of 2 atm?
A. 1 L
B. 2 L
C. 3 L
D. 4 L
Question 3
The reaction between potassium permanganate and sulfuric acid is a classic example of an oxidation-reduction reaction. Which of the following best describes the products of the reaction?
A. MnSO4 and H2SO4
B. MnSO4 and SO2
C. MnO2 and H2SO4
D. MnO2 and SO2
Question 4
A solution of NaOH is prepared by dissolving 10 g of NaOH in 100 mL of water. What is the molarity of the solution?
A. 0.1 M
B. 0.5 M
C. 1 M
D. 2 M
Question 5
A metal has a density of 10 g/cm^3. What is the mass of 20 cm^3 of the metal?
A. 100 g
B. 200 g
C. 300 g
D. 400 g
Question 6
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 the solution in g/L?
A. 0.6 g/L
B. 6.0 g/L
C. 60 g/L
D. 600 g/L
Question 7
A sample of 3.0 g of a subs\tance is dissolved in 50 mL of water to give a solution with a pH of 3.0. What is the concentration of the solution in M?
A. 0.1 M
B. 0.5 M
C. 1.0 M
D. 2.0 M
Question 8
A polymer has a molecular weight of 100,000 g/mol and a degree of polymerization of 500. What is the molar mass of the monomer?
A. 200 g/mol
B. 400 g/mol
C. 500 g/mol
D. 1000 g/mol
Question 9
A metal has a density of 8 g/cm^3. What is the volume of 100 g of the metal?
A. 5 cm^3
B. 10 cm^3
C. 15 cm^3
D. 20 cm^3
Question 10
A sample of 4.0 g of a subs\tance is dissolved in 100 mL of water to give a solution with a pH of 5.0. What is the concentration of the solution in M?
A. 0.1 M
B. 0.5 M
C. 1.0 M
D. 2.0 M
Question 11
Calculate the s\tandard enthalpy change (ΔH) for the reaction: CaO(s) + H2O(l) → Ca(OH)2(s). Given that the s\tandard enthalpy of formation of CaO(s) is -635.09 kJ/mol and the s\tandard enthalpy of formation of Ca(OH)2(s) is -986.09 kJ/mol.
A. -351.2 kJ/mol
B. -351.9 kJ/mol
C. -352.1 kJ/mol
D. -352.5 kJ/mol
Question 12
A solution of HCl is prepared by dissolving 10 g of HCl in 100 mL of water. What is the pH of the solution?
A. 1
B. 2
C. 3
D. 4
Question 13
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 remaining after 10 years?
A. 25 g
B. 50 g
C. 75 g
D. 100 g
Question 14
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. 2 M
Question 15
A polymer has a molecular weight of 5000 g/mol and a degree of polymerization of 100. Calculate the molar mass of the repeating unit.
A. 50 g/mol
B. 100 g/mol
C. 200 g/mol
D. 500 g/mol

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