POST UTME UNIOSUN 2025 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 0.5 M solution of NaOH is titrated with 0.1 M HCl. What is the pH of the solution after 25 mL of HCl has been added?
A. 10
B. 11
C. 12
D. 13
Question 2
A 2.0 g sample of a hydrocarbon has a molecular weight of 42 g/mol. Calculate the empirical formula of the hydrocarbon.
A. C2H6
B. C3H8
C. C4H10
D. C5H12
Question 3
A 1.0 L sample of a gas at 25°C and 1 atm is collected and found to have a mass of 2.5 g. What is the molar mass of the gas?
A. 20 g/mol
B. 30 g/mol
C. 40 g/mol
D. 50 g/mol
Question 4
The half-life \( t_\( 1/2 \ \)) of a first-order reaction is 10 minutes. If the initial concentration of the reac\tant is 1.0 M, what is the concentration of the reac\tant after 20 minutes?
A. 0.25 M
B. 0.5 M
C. 0.75 M
D. 1.0 M
Question 5
A solution of 10 g of NaCl in 100 mL of water has a freezing point of -1.5°C. Calculate the molality of the solution.
A. 0.1 m
B. 0.2 m
C. 0.3 m
D. 0.4 m
Question 6
A 2.0 g sample of a non-metallic oxide is heated in a stream of carbon dioxide gas. The resulting gas is collected and found to have a volume of 2.5 L at 25°C and 1 atm. What is the molar mass of the oxide?
A. 50 g/mol
B. 60 g/mol
C. 70 g/mol
D. 80 g/mol
Question 7
A 1.0 M solution of H_(2)SO_(4) is mixed with 1.0 M solution of NaOH. If the reaction is complete, what is the concentration of the remaining H_(2)SO_(4) after the reaction?
A. 0.5 M
B. 1.0 M
C. 1.5 M
D. 2.0 M
Question 8
A 1.0 M solution of H2SO4 is mixed with a 1.0 M solution of NaOH. What is the resulting solution?
A. H2O
B. Na2SO4
C. H2SO4
D. NaHSO4
Question 9
A polymer is formed by the condensation reaction of two monomers. Which of the following is a characteristic of the polymer formed?
A. The polymer has a high melting point.
B. The polymer is soluble in water.
C. The polymer has a high tensile strength.
D. The polymer is biodegradable.
Question 10
A 1.0 M solution of NaOH is mixed with a 1.0 M solution of HCl. What is the pH of the resulting solution?
A. 7
B. 8
C. 9
D. 10
Question 11
A 1.0 M solution of HCl is mixed with a 1.0 M solution of NaOH. What is the resulting solution?
A. H2O
B. NaCl
C. HCl
D. NaOH
Question 12
A 5 g sample of a polymer is found to have a molecular weight of 10,000 g/mol. What is the number of polymer chains in the sample?
A. 10^6
B. 10^7
C. 10^8
D. 10^9
Question 13
A 2.0 M solution of H2SO4 is mixed with a 2.0 M solution of NaOH. What is the pH of the resulting solution?
A. 0.5
B. 1.0
C. 1.5
D. 2.0
Question 14
A solution of hydrogen peroxide (H2O2) is decomposed by a catalyst to produce oxygen gas. The reaction is first-order with respect to hydrogen peroxide. If the initial concentration of hydrogen peroxide is 0.1 M and the half-life of the reaction is 10 minutes, what is the concentration of hydrogen peroxide after 20 minutes?
A. 0.05 M
B. 0.025 M
C. 0.01 M
D. 0.005 M
Question 15
The reaction of zinc metal with copper(II) sulfate solution is represented by the equation: Zn(s) + CuSO4(aq) → ZnSO4(aq) + Cu(s). What is the oxidation state of copper in the reac\tant and product?
A. Cu(II) in reac\tant and Cu(0) in product
B. Cu(0) in reac\tant and Cu(II) in product
C. Cu(II) in reac\tant and Cu(I) in product
D. Cu(I) in reac\tant and Cu(II) in product

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