POST UTME UI 2025 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A solution of NaOH is used to titrate a solution of HCl. If 25 mL of HCl is required to reach the equivalence point and the concentration of HCl is 0.5 M, what is the concentration of NaOH?
A. 0.25 M
B. 0.5 M
C. 0.75 M
D. 1 M
Question 2
The compound with the molecular formula C2H6O is _______.
A. Ethanol
B. Methanol
C. Acetaldehyde
D. Acetone
Question 3
A 2.0 g sample of a non-metallic element is found to have a mass of 2.5 g after being heated in a Bunsen burner flame. What is the percentage increase in mass?
A. 10%
B. 20%
C. 30%
D. 40%
Question 4
A 0.500 M solution of sodium chloride (NaCl) is prepared by dissolving 35.5 g of NaCl in water to make 1.00 L of solution. What is the molarity of the solution?
A. 0.500 M
B. 0.750 M
C. 1.00 M
D. 1.25 M
Question 5
The reaction of cyclohexane with bromine in the presence of light yields 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 6
The diagram below shows a titration setup. Identify the part labeled A.
A. The burette
B. The pipette
C. The Erlenmeyer flask
D. The thermometer
Question 7
The reaction of hydrogen gas with oxygen gas yields water. What is the balanced chemical equation for this reaction?
A. 2H2 + O2 → 2H2O
B. H2 + O2 → H2O
C. 2H2 + 2O2 → 2H2O
D. H2 + 2O2 → 2H2O
Question 8
The reaction between sodium carbonate and hydrochloric acid is _______.
A. Na2CO3 + 2HCl -> NaCl + H2O + CO2
B. Na2CO3 + 2HCl -> NaCl + H2O + CO
C. Na2CO3 + 2HCl -> NaCl + H2O + CH4
D. Na2CO3 + 2HCl -> NaCl + H2O + C2H6
Question 9
A 1.0 M solution of H2SO4 is prepared by dissolving 98.0 g of H2SO4 in 1.0 L of water. What is the concentration of H+ ions in the solution?
A. 0.5 M
B. 1.0 M
C. 1.5 M
D. 2.0 M
Question 10
Determine the s\tandard enthalpy of formation of the compound C2H6O (ethanol) from the following data: ΔHf(C2H6O) = -234.7 kJ/mol, ΔHf(C2H6) = -84.7 kJ/mol, ΔHf(O2) = 0 kJ/mol. Assume that the reaction is carried out at 298 K.
A. -150.0 kJ/mol
B. -200.0 kJ/mol
C. -250.0 kJ/mol
D. -300.0 kJ/mol
Question 11
The reaction of sodium hydroxide with acetic acid yields sodium acetate and water. What is the balanced chemical equation for this reaction?
A. NaOH + CH3COOH → NaCH3COO + H2O
B. NaOH + CH3COOH → NaOH + CH3COO-
C. NaOH + CH3COOH → NaCH3COO + H2O
D. NaOH + CH3COOH → NaOH + CH3COOH
Question 12
A sample of a polymer has a molecular weight of 100,000 g/mol. If the polymer is composed of 80% monomer A and 20% monomer B, what is the average molecular weight of the polymer?
A. 80,000 g/mol
B. 90,000 g/mol
C. 100,000 g/mol
D. 110,000 g/mol
Question 13
The diagram below shows a titration setup. What is the purpose of the burette?
A. To measure the volume of the titrant
B. To measure the volume of the analyte
C. To mix the titrant and analyte
D. To separate the titrant and analyte
Question 14
A metal M reacts with chlorine gas to form a white solid MX. If 2.5 g of M is used and 3.2 g of MX is formed, what is the percentage yield of MX?
A. 80%
B. 85%
C. 90%
D. 95%
Question 15
A solution of 0.1 M NaOH is prepared by dissolving 3.0 g of NaOH in 1.0 L of water. What is the concentration of OH- ions in the solution?
A. 0.05 M
B. 0.1 M
C. 0.15 M
D. 0.2 M

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